I have nitto terra grapplers on my work truck. 97 chevy 2500 4x4. They have about 40k on them now and still have some life left, but not a ton. Miles were largely in town, prob 80-90 percent, along with plenty of jobsite mud/gravel/dirt. Also prob had a 4000 lb tailer 20 percent of those miles, and an 8k load ten percent.

FWIW.