I am using my favorite size 265/75/16
I dont need more for tires my wheeling is jumping sidewalks and sand thats it I need the lift because I don't want get stuck on the tip of the dunes now I am using force by hitting it so I realy don't want that!
If it were my truck and I was running that tire size, I would crank the torsion bars just a little bit and leave it there. Adding a suspension lift won't actually increase your ground clearance. In fact, you'll actually have to lower your torsion bars below the frame so your break over angle will be worse (less ground clearance) then if you left it stock.
Suspension lifts are really only good for stuffing bigger tires under your truck. These taller tires increase ground clearance to negate the negative affects of the suspension lift.
Just a recommendation, but save your money and don't stick a suspension lift under that truck if you are going to stay with that tire size. Unfortunately you will most likely be very unhappy with the results b/c you'll actually hurt your ground clearance.
I hope this helps!! If you have any more questions, ask away.