Are you really having trouble with the LT235's? That's supposed to be a good all-around size...
Yeah :( Have yet to actually wear out a set since we moved out here 12 years ago. Usually ruin one or two before they are half worn out and end up buying another set of four.
The Suburban weighs over 5000 pounds empty, and C range radial tires seem to pop like balloons. OTOH, we used to have a K-10 with a heavy camper shell and it did fine way up in the Colorado mountains (where we had real rocks, not just mudstone) with the old bias ply 7.00-15.
We've basically only driven it in the winter for the past couple years. I like the old solid axle trucks but I'm seriously considering trying to trade it for something with 16" wheels.