Dude just go fuel cell and be done with it. If you're going to be doing that much hardcore crawling to want 70s you wont want that gas tank dragging and hanging up on stuff. Also, going 70 isn't worth except the rear, run a 60 up front and put chromo 35s in it. You won't make enough power to blow a 60 ring and pinion up and I wouldn't want to lose even more ground clearance. It looks like another guy in the xtreme section here is going to run a fuel cell and double or single tri 4 link in his. According to his post it should be going in the shop soon, Id see what he does for ideas, it seems to be the most extreme JK so far from what I've seen.

 

oh and im going to go with fox coilovers. im done dealing with bolt on stuff