Second the BFG AT's. That is all I run on my street/trail rig, and they work really well. The last set I got 75k miles out of before buying new, and at the time they still had at least 10k street miles left in them, they had just weather cracked(7yrs old), and weren't trail worthy for wheeling in snow anymore.

As mentioned too small of a tire to effect much on the performance side.

More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed