That is awesome! I really like it, and everything you've thought of for those comforts off the grid...
I've got a local off-road shop building me an box trailer (similar to a Pikes Peak trailer). It will share my 32" MTRs, for as you said, to be able to share tires. I'll still use a traditional tent (I may get a roof-top tent later?), but for now I'll have room to carry some decent cots to get off of the ground. I'll see how it goes as I'll probably modify the trailer as time goes on. It does have a 12 volt power system. Tomorrow I've got to finish up tying up the wires under the dash for the brake control that I installed last weekend, as like yours the trailer does have electric brakes. I installed the Mopar 7-way wiring harness last fall (made for an LJ).
Anyway, I'm picking it up on Saturday if everything is ready to go. I also want a trailer for extended stays out in the woods. Last summer I camped at 11k feet elevation in Colorado just below a mountain pass. It was awesome, but what fits in the back of my TJ is called minimalistic camping.
Thanks again for sharing your notes!