I never made it to Afganistan, but the pics and videos from friends show some crazy looking terrain. I bet there are some places there that would rival KOH courses.
I can say that wheeling experience is a definite benefit though. I wish my first Bradley driver didn't grow up in the city... //:hlp//
In Iraq I can remember several multi day missions in the western part of Anbar where we had to climb out of one and over/cross into another wadi (essential dry river beds). It was tough to get a HMMWV that was 3 times the weight it was originally designed to be over the rocky terrain. Good news was you didn't have to worry about rocker protection, the armor plate worked pretty well for that. At one point we got into to the habit of carrying 2 spares per vehicle bc we were slicing sidewalls that much. Most tires were the old Goodyear MTs, or the MTR, but at the end we started getting BFG Baja T/As which seemed to be tougher. Some units that had funding for non standard supply were getting Interco TSL/SX in the 38 X 12.50 X 16.50 size bc they ran small and were roughly the size of the 37s that the HMMWVs came with.