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Towing capacity guesstimator after lift and 37" tires?

Sandman 4x4

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So if a vehicle passes the SAE testing and comes up with a particular number, the manufacturer isn't going to use that number as the tow rating, even though the SAE testing takes the vehicles to their limits of steering, braking, cooling systems and so on? It's just a recommendation?
That testing is crazy intense and rigorous, and it would seem to me that towing over the number they earn is asking for some serios trouble.

Talking of springs - stiffer springs can cause understeer - in other words, the vehicle won't turn where you want it to go in an emergency. So it's ok if you put on heavier springs and now it can't meet the SAE steering while towing requirements

Increased ride height increases body roll and understeer.

So bigger tires reduce your ability to stop - meaning you may no longer meet those SAE test numbers.
Stiffer springs, sometimes used in lifts - increases understeer. That means in a turn it no longer goes where you want it to go but will likely swing wide.
Taller springs can do the same - increase understeer .

These also change sway characteristics greatly - meaning your lift can cause you to have different issues with trailer sway, perhaps even less ability to control it.

The Mojave wasn't available until into 2020, possibly didn't get tested with the others (virtual or physically). Also note the max tow numbers were changed later - perhaps some re-testing OR, the weights changed. If you note how the tow ratings are figured, any change to vehicle weights can impact the performance and results in the SAE J2807 testing.

Once testing has been completed and a truck model meets all of the criteria, the basic calculation for the SAE maximum Tow Weight Rating is: TWR = GCWR – TVTW. By subtracting the total weight of the tow vehicle (the TVTW includes the weight of the driver, passenger, and additional equipment) from the tested GCWR, the result is the SAE J2807-compliant Tow Weight Rating.

Change the vehicle weight, and you get different results.

Lifts, tires, vehicle weight - all impact the tow numbers.

So yes, those things do impact towing by REDUCING the numbers
How much?
Only taking it through the testing will tell that! There's no such thing as a calculator!

Again,

Absolutely all info worth reading and heeding.
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Sandman 4x4

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Nobody has to weigh it after an accident. I've watched IHP troopers get information about the vehicles from the info gathered at accident scenes. Their computer programs are amazing. They can tell a vehicle's trajectory, speed, weight and so on at any given point in an accident. They have stats gathered at hundreds of thousands of accidents as well as the computer smarts to tell you "at point A, vehicle was traveling xx mph, at point B it was yy mph" and more - as well as what the vehicle's weight was without cheating and looking it up. Physics.
Very impressive stuff they have even in Iowa.
If it wasn't a thing, the Sgt. I spoke with would have never warned about civil cases.
No, they aren't going to pull over a rig and weigh it, not non-commercial rigs.
You can get by with a lot of shit that isn't safe - until that one time when someone pulls out in front of you, or you get cut off or something causes the need for above and beyond maneuvers - and you can't.
You can get by with a lot of deadly crap - and that's really the problem a lot of us have with it - those that get by until that one time they kill someone because of their selfishness, arrogance, "you can't tell me what to do" attitudes.
Unfortunately all facts. But some stubborn people will never listen to reason if they have a mind set to do something.
 

Zachanadandy

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So far yes you’re half right, only the payload rating is actually on the sticker. However as the driver it’s your duty and responsibility to not be ignorant about your vehicle and what it’s capable of. Hey you want to go out there and create a hazard for all the folks around you? That’s not right. Also that ignorance will provide the grounds for your insurance company to drop you, leaving you out to live with a huge financial mess. Good luck.
I love how everyone's convinced the insurance company won't cover you if you exceed the payload or towing capacity with 0 evidence. DUI, way more irresponsible, still covered. 3x the speed limit? Way more dangerous, still covered. Blow a red light? Far greater hazard, still covered. Driving the wrong way on the freeway? Practically eminent danger, still covered. 200lbs too much payload? You're a menace and insurance won't cover you. The more you think about it the dumber it sounds. Insurance covers irresponsible and even criminal every day.
 

ShadowsPapa

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So far yes you’re half right, only the payload rating is actually on the sticker. However as the driver it’s your duty and responsibility to not be ignorant about your vehicle and what it’s capable of. Hey you want to go out there and create a hazard for all the folks around you? That’s not right. Also that ignorance will provide the grounds for your insurance company to drop you, leaving you out to live with a huge financial mess. Good luck.
I've found cases in the RV forums (posted a bit of what I've found) and it varies widely with the insurance company, but in most cases, you are covered, however - because you were being stupid, your rates will go up or you risk being dropped. Contracts vary, of course, so you can't say "they won't drop you". Likely they'll cover your LIABILITY in an accident - that's what liability coverage is all about - you are stupid or sleeping and you cause an accident, you are liable for the damages, thus, liability insurance. Sure, they will likely cover you, however...............
I've found conversations involving people in the insurance business and who had vehicles "recertified" to carry more load. But - that appeared to get sticky, too, as far as insurance went. They only cared about the manufacturer's numbers.

I might ask - why do people risk it? But then - all I have to do is look around me any time I leave home for the highways and I'm surrounded by people risking by being arrogant (I don't care what they say, look, I'm doing it and I'm fine) or ignorant (book? What book?) or lazy (safety chains dragging on the pavement, lights not working, load not strapped down, whatever)

From a Subaru owners manual ->
Jeep Gladiator Towing capacity guesstimator after lift and 37" tires? 1754839327436-w6

"Must not", not "we suggest" or "it's recommended", but "must not".

Gee, doesn't Jeep pretty much say the same thing? This is from Jeep's book -
Jeep Gladiator Towing capacity guesstimator after lift and 37" tires? 1754839480110-5x


It's not a suggestion or recommendation, they say "must not".

I also suggest there's a lot of assuming going both ways, but, if I was Jeep thinking of a pickup based on the Wrangler, and wanted it to be "best in class" towing and payload - would I not take it to the limits, get those SAE numbers nailed down and use them in my marketing?
If I was fine at 8,000 pounds towing and passed all of those SAE tests and they said "you are fine with this rig for 8,000 pounds, you passed" - would I not say "best in class at 8,000 pounds" ???? Because frankly, from what I see, you can actually find those numbers - although I've not tried.
If my new vehicle mule passed all of the tests and the SAE math says I could tow 8,000 pounds, you can believe I'm going to say I can tow 8,000 pounds. Ford will - and in fact, Ford has CHEATED before by removing the spare and rear bumper (because Ford said "uh, those are optional"). Ford is going to go all out.
Again, that's speculation, but it's also speculation to say "Jeep got the JT through 8,000 pounds but they are only going to say 6,000 pounds." while Ford made it through 8 and claimed 8.

Much we don't know - in our traffic, you'd be an idiot to try to max out the towing numbers.
 

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Zachanadandy

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I've found cases in the RV forums (posted a bit of what I've found) and it varies widely with the insurance company, but in most cases, you are covered, however - because you were being stupid, your rates will go up or you risk being dropped. Contracts vary, of course, so you can't say "they won't drop you". Likely they'll cover your LIABILITY in an accident - that's what liability coverage is all about - you are stupid or sleeping and you cause an accident, you are liable for the damages, thus, liability insurance. Sure, they will likely cover you, however...............
I've found conversations involving people in the insurance business and who had vehicles "recertified" to carry more load. But - that appeared to get sticky, too, as far as insurance went. They only cared about the manufacturer's numbers.

I might ask - why do people risk it? But then - all I have to do is look around me any time I leave home for the highways and I'm surrounded by people risking by being arrogant (I don't care what they say, look, I'm doing it and I'm fine) or ignorant (book? What book?) or lazy (safety chains dragging on the pavement, lights not working, load not strapped down, whatever)

From a Subaru owners manual ->
1754839327436-w6.webp

"Must not", not "we suggest" or "it's recommended", but "must not".

Gee, doesn't Jeep pretty much say the same thing? This is from Jeep's book -
1754839480110-5x.webp


It's not a suggestion or recommendation, they say "must not".

I also suggest there's a lot of assuming going both ways, but, if I was Jeep thinking of a pickup based on the Wrangler, and wanted it to be "best in class" towing and payload - would I not take it to the limits, get those SAE numbers nailed down and use them in my marketing?
If I was fine at 8,000 pounds towing and passed all of those SAE tests and they said "you are fine with this rig for 8,000 pounds, you passed" - would I not say "best in class at 8,000 pounds" ???? Because frankly, from what I see, you can actually find those numbers - although I've not tried.
If my new vehicle mule passed all of the tests and the SAE math says I could tow 8,000 pounds, you can believe I'm going to say I can tow 8,000 pounds. Ford will - and in fact, Ford has CHEATED before by removing the spare and rear bumper (because Ford said "uh, those are optional"). Ford is going to go all out.
Again, that's speculation, but it's also speculation to say "Jeep got the JT through 8,000 pounds but they are only going to say 6,000 pounds." while Ford made it through 8 and claimed 8.

Much we don't know - in our traffic, you'd be an idiot to try to max out the towing numbers.
Note in typical lawyer fashion its a whole bunch of "maybe, could be, possibly liable for extra damages" and every one of those vague hypothetical statements was proceeded by "if you CAUSE an accident. Being over weight will never change who was at fault which is what I've said a million times. If insurance could just opt out of covering dumb, irresponsible, or even criminal then liability coverage would be useless. 1 or some combination of those 3 is the cause of nearly every accident ever. Even if you weren't cited for it, short of major mechanical failure I can't picture an accident you cause that technically didn't involve some sort of traffic violation. Side swipe the car in your blind spot? I'd call that an unsafe lane change. Hit the guy in front of you that slows down to turn into a driveway? Sounds like failure to yield and/or following too close? Pull out in front of someone on the highway and get hit? Unsafe merging and failure to yield. And yet the insurance pays? Almost like it pretty much only exists to cover irresponsible, unsafe, and/or illegal actions?
 

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Note in typical lawyer fashion its a whole bunch of "maybe, could be, possibly liable for extra damages" and every one of those vague hypothetical statements was proceeded by "if you CAUSE an accident. Being over weight will never change who was at fault which is what I've said a million times. If insurance could just opt out of covering dumb, irresponsible, or even criminal then liability coverage would be useless. 1 or some combination of those 3 is the cause of nearly every accident ever. Even if you weren't cited for it, short of major mechanical failure I can't picture an accident you cause that technically didn't involve some sort of traffic violation. Side swipe the car in your blind spot? I'd call that an unsafe lane change. Hit the guy in front of you that slows down to turn into a driveway? Sounds like failure to yield and/or following too close? Pull out in front of someone on the highway and get hit? Unsafe merging and failure to yield. And yet the insurance pays? Almost like it pretty much only exists to cover irresponsible, unsafe, and/or illegal actions?
Note I said in the beginning of that - liability covers you for being ignorant, dumb, lazy or reckless - in cases where you screwed up in some way, shape or form, and are liable.
They will likely cover you - that's why it's called liability and that is mandatory, at least here.
Only if you are doing something illegal, based on the terms in your individual contract and likely even by STATE laws, that's different.
If you are transporting fire arms illegal in CA - all bets are off.
If you are simply using a dangerous hitch setup, or over-weight - and are the cause or found partially at fault, that's liability coverage there.
 

Sandman 4x4

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I love how everyone's convinced the insurance company won't cover you if you exceed the payload or towing capacity with 0 evidence. DUI, way more irresponsible, still covered. 3x the speed limit? Way more dangerous, still covered. Blow a red light? Far greater hazard, still covered. Driving the wrong way on the freeway? Practically eminent danger, still covered. 200lbs too much payload? You're a menace and insurance won't cover you. The more you think about it the dumber it sounds. Insurance covers irresponsible and even criminal every day.
Then after the slim chance they actually do, then you have to deal with civil courts, not to mention there’s a slim chance you’ll be able to get, or afford coverage after that.
 

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Then after the slim chance they actually do, then you have to deal with civil courts, not to mention there’s a slim chance you’ll be able to get, or afford coverage after that.
People get coverage after DUIs. People get coverage after vehicular homicide. Nobody cares about a few hundred pounds period.
 

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People get coverage after DUIs. People get coverage after vehicular homicide.
People can also be dropped after they make the payment, or raise rates so high you can't afford that company and have to switch to one that covers any moron.
 

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Zachanadandy

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People can also be dropped after they make the payment, or raise rates so high you can't afford that company and have to switch to one that covers any moron.
True, but show me one example of a single instance where rates were raised because someone towed a few hundred pounds over the limit. DUI, or even at fault accidents will affect rates for sure. Being in a non-at fault accident? Nope and again nobody would ever know or care about the weight.
 

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again nobody would ever know or care about the weight.
It's easy to know - don't even need scales.
Care? Isn't that a bit wide-open? Assuming?
 

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It's easy to know - don't even need scales.
Care? Isn't that a bit wide-open? Assuming?
The whole trailer weight thing and "insurance won't cover you, you're going to jail, personal liability, fear mongering has been a thing for 25+ years in internet forums since the pirate4x4 days and nobody ever had any real world evidence. The accident software is great, but it's still an estimate. You aren't getting ticketed for it. Even if it estimated your trailer at 20k pounds and you're speed at 100mph. You wouldn't get a speeding ticket because it has to be measured not calculated. That insanely over weight you'd likely end up on a scale (if you caused the accident) as they actually do need one for any kind of enforcement. Even if you were towing 20k pounds and someone hit you, nobody would care.
 
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ShadowsPapa

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Even if it estimated your trailer at 20k pounds and you're speed at 100mph. You wouldn't get a speeding ticket because it has to be measured not calculated.
Not entirely true. That I also know from experiences.
The trooper doing one accident investigation determined the vehicle speed at various places and said "speeding wasn't involved" and there would be no citation for speeding. Failure to maintain control was involved. There's a lot that can be taken to court these days.
Accident reconstruction software can indeed be used in court to prove speeding as long as all legal requirements are followed. It does not require a radar gun to charge you with speeding or other offenses.
And of course, your vehicles own data can be subpoenaed by an attorney.

The bad info out there fogs the real info out there.
 

Zachanadandy

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Not entirely true. That I also know from experiences.
The trooper doing one accident investigation determined the vehicle speed at various places and said "speeding wasn't involved" and there would be no citation for speeding. Failure to maintain control was involved. There's a lot that can be taken to court these days.
Accident reconstruction software can indeed be used in court to prove speeding as long as all legal requirements are followed. It does not require a radar gun to charge you with speeding or other offenses.
And of course, your vehicles own data can be subpoenaed by an attorney.

The bad info out there fogs the real info out there.
The software can determine that speeding was involved and it would be noted as a contributing factor in determining fault, but to my knowledge you can't be cited for speeding based off of that. I know from an attorney in the family that's how it works here. Could vary by state but I've still never seen it.
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