I'm 2.5" on the front and 2" lift on the rear.
That camper is 3500lbs dry, plus the hitch weight of the trailer. I run airbags, but also Tork lift blocks that engage the overload springs after aprx .75" of suspension travel. I HATE when a truck is dragging its ass down the road. Here's a link to the blocks.
http://www.torklift.com/index.php/products/suspension/stableload
I take them out when I'm not hauling the camper. (about 5-10 minutes). On previous trucks, the airbags would be maxed out and the overloads weren't engaged at all. These blocks are a simple but awesome solution.
Front grill surround, front and rear bumpers, side steps, mirrors were all wrapped in brushed, black vinyl. Headlights lightly tinted, Recon tails, Blacked out dually markers, cab lights and mirror lights.
295 60 20's measure 34.5" tall by 11.7" wide. Just slightly narrower than a 35x12.5x20. I don't run a spacer on the rear and I've got ample room. They stick out past the fenders by about 1-1.5". I BARELY clear my camper jacks when loading the camper, and I'm running the swing out "dually" compatible jacks.