my 2000 escalade just turned 70,000 miles without any major issues. I've had it off-road on many occasion,mostly in low4-1st gearwith about 20lb's of air in BFG M/T's.Only once did I need to winch it out and that was because the back was full of firewood. I am running it with a Volant intake, Aeroturbine 3" exhaust and a Hypertech program. All in all it's been nothing but fun.