Some of the Mopar performance parts have been recentley discontinued, including the performance rock rails and (I believe) the hard fold tonneau cover (the newest version).
I used the McGard spline drives on my JL with Method 313s and will be using them agin on my JT's 313s. Any of the narrow seat spline drives should work, Method even sells their own sets.
You could try Athens Dodge, they gave me a great deal on the Trail Rails at $295.05 delivered, no tax. They usually have a code for free shipping up to $100 value, not including oversize items.
Athens Dodge
If you are looking at the Method 313 +25 wheels TireRack.com has them on clearance sale right now for a crazy awesome price of $196.xx! Just picked up a black set for my Mojave!
Unverified on what is different or the same, maybe even isn't released yet. That's why I made note that I could not find the instruction for it anywhere. I would not buy at this point.
That's a great look and the ATIII are supposed to only weigh 63 lbs. The same size Trial Graps are almost 10 lbs heavier. The stock 33 Falken ATs even weigh a little more than the Toyos!
Looks like a great opportunity for the fridge makers to design a long and low fridge specific for the midsize pickup bed market. Or even better a low profile 60/40 fridge freezer dual zone.
Did some research and here is what I found:
If you have a JT WITH front threaded lower holes, these are the Mopar part numbers for your truck:
Soft tri-fold: 82215615
Hard tri-fold: 82215616
Soft roll up: 82215617
JT WITHOUT front threaded lower hole, use these Mopar numbers:
Soft tri-fold...