You can run 32 X 10.5 R15 just dandy, IMO. Probably without needing to regear.
There is only one streetable 32 X 10.5 R15 tire that I know of, but luckily it's a dandy moderate hybrid tread.
The Parnelli Jones Dirt Grip 31 X 10.5 R15 (stated size) runs taller than stated. It's actually a 31.5 X 10.5 R15 tire. I think that's the largest you can run with good results with a 2" lift. It might not need regearing either. Probably doesn't need regearing if you have a manual transmission and 4L engine.
The PJ tire will be as good on road as a BFG AT, but much better offroad. I think the PJ is one of the most under rated and over looked tires there is. It's a good hybrid, especially in this unique size.
Another tire you might consider, though I'm not sure if you have enough lift for it, is the Dean SXT MT 33 X 9.5 R15. It's a hybrid tread that is excellent IMO, after adding more sipes to center treads. It runs shorter than stated size (which helps you). It runs an actual 32.5 X 9.5 R15. Not sure if you could fit something that tall though. If you had 2.5" lift, I think you could. With 2" lift, the Parnelli Jones 32 X 10.5 is a safer bet for you.
Both those tires would work great with stock 15 X 8 wheels.
P.S. - BFG AT makes a 33 X 9.5 R15 tire, but I think the Dean SXT MT in that size is better for you - due to hybrid tread and running 0.25" shorter. The PJ 32 X 10.5 R15 is your best bet though, with 2" lift.