I am in the same boat as you with the seats, my drivers seat base is all cracked and coming apart. I have been looking for better than a year for a new seat bottom, but haven't found anything. a year back someone was selling a full rebel seat cover on eBay and I missed it and thats the only one I have seen.
I am also running the same size tires and I still like them
Yes, that was a big pain in the butt I first noticed the cushion was worn on the 15-hour drive back from Wisconsin I tended to sit a bit slanted like my but didn't want to stay in the middle of the seat and slid towards the door. I have contemplated seat covers, but that's like buying a sexy Ferrari and putting a leather bra thing on the front. Part of the amazingness of this truck is opening that door and that gorgeous interior. Everyone that has seen or been in my truck loves it. I might just say f it and go directly to a Mopar dealer and see if they can get them. I wouldn't mind some of those seat back mounts with the mole attachments though. For a while when shooting and other stuff, I put the seats up in the back and use the flat fold-out thing. I don't know why but when I get in my truck with my seats folded up it just looks strange to me ( I know I'm knit-picking).
Honestly, that tire size is great, taller than stock. Great on gas mileage, downside not many choices of tire in that size, and some of those tires cost more than the equivalent 315/70R17. I'm still torn if I want to keep that size or go bigger possibly to 285/75R18 which on the tire calculator is 34.8 but still the same width or just go 315/70R17 which is barely half an inch taller than our current size, but there are way more choices in that size. I think I got too carried away watching xoverland builds. I notice most of the Tacoma/4runners they do 33's and the ram/tundra builds go to 315/35's. Downside is if I go either of those I need new wheels. 315 fit our truck but they are ungodly close to the upper control arm.
Quick question what PSI do you run? I know our factory is 55 45. Coming from vehicles that usually ran 32/35 psi on rutter dirt roads I would drop to 25ish, in snowy mountains offroad or rocky trails(not supper rocky but typical colorado mountain stuff) I would go 18ish.
With the Rebel, I'm not sure what to run yet. I got ahold of the some youtuber with a rebel forgot his name asian looking guy. He said as soon as he hits trails he drops down to about 30psi front and rear. (logging road trails and such.)