I've had the exact same truck since '96, it's a family member. Suspension is just as stock as the day I bought it.
I have 34x10.5x15 LTBs on it right now with zero rubbing, and I wheel the piss out of it in the rocks. Key is to use a narrow tire, narrow rim, and as much backspacing as possible. When you get those wide, offset setups that most of the boneheads out here run, you destroy the IFS, steering, and you start hitting the fenders when you turn. If you keep those sidewalls in the fenders where they were designed to be, everything works gravy and the truck handles great.
Interco and BFG make some 33x9.50s. One of the will probably be the next tires going on the truck. Now that the wheeler is rolling again, I can't wait to go back to a radial on my DD.
Plowing requires a tall, narrow tire to get enough contact pressure to push a heavy load of snow. Interco TRXUS MTs are a great snow tire that does well Offroad. Toyo And Cooper MTs are great too, although I'm not sure how much of a pizza cutter they come in. I currently run triple studded BFG commercial tires on my plow truck back in AK. They are awesome for plowing, but they aren't designed to clean mud out well. I'd take them over the BFG ATs as an Offroad tire though. I don't care for BFG ATs for plowing because they pack up in sticky snow too easily, but I know a lot of guys that love them. 235/85/16s are easy to find, common, and a pretty tall and realy narrow tire.
Of course, absolutely nothing plows better than v-bar chains on all four tires with some gravel bags in the bed. Except maybe a road grader.