I agree w/Matt. You go HD on all your parts for 35s and get robbed. I did the AGR box/bracket, shimmed it all correctly, hd steering stabilzer, D44 rear w/hd gears etc. I should be strong enough for 38s! But try to find a shop that will order 2 or 3 sets of tires to see which look/fit the best. It's a crap shoot, for the easiest thing to mount on a Jeep....that will also have the most effect on handling and off road performance.
I've also learned that sometimes... when people don't agree with you .... its best to hold them down and kidney punch them till they agree with you