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Essentially "Heat Index" is a bunch of needlessly complex guesswork. I like to keep it simple. ;)

EGR lowers combustion chamber temperatures which has the result of increasing soot production while decreasing NOx, so turning off EGR will cause the DPF to fill up slower but also increase DEF consumption to take care of the increased NOx production.

Check the owner's manual or any placards on your specific trailer to see what the lug nuts are supposed to be torqued to. There's a very good chance the correct spec is higher than 100ftlb. As an example, the ones on my 16RD are spec'd at 120ftlb.

For an intermittent rear camera problem, the first thing I would do is remove the access panel in the tailgate and check for a loose wire/cable connection at the camera.

That's not cool... figuratively or literally.

Did your exhaust really melt the rear bumper fascia?

I've never felt the need for anything larger than a 33. Funny enough, when I first bought my LJ it had 35s on it, and within the very first week I dumped those and installed a set of 33s.

See attachment for the TSB. FWIW, the problem has been mostly corrected on my '21 JTRD by installing Bilstein 5100 shocks.

OP stated the trailer has surge brakes.

Yes, they are the same three transmissions regardless of trim on previous year models, and as noted, now we're down to just the 850RE.

Yep

I'd suspect a loose pin connection for the door lock in that door's wire harness/pigtail. Sometimes it'll make a good connection, other times not which results in the door lock not working properly.

Sounds like the first key fob is flaking out. Could be the lock button is sticking, or maybe you just need to replace the battery in that fob.