Also check for clearance between the wheels if you use a locking-type chock and above the wheels...you want a minimum of 2 1/2" above the tire for suspension travel. Reason for so much is that the equalizer link will let one axle get higher then the other when going over a bump.
I upgraded to LTs 2 yrs ago and wound up with rubbing against the top of the fenderwell, so I installed the Correct Track alignment kit to give me an extra 2" of body lift, now no issues.
Load rating and rim rating both important but so is outside diameter....you can use a site like Tire Rack to get sizing specs on the brands and sizes you are considering and compare them to the diameter and width of your current tires to assess fitment.