How many miles is too many?

[HummerJim]

To me, the PPI you have done, the carfax, the maintenance history, the useage (onroad or offroad) and records of a used car trump mileage. The H2 is a rugged machine and that 6.0L V8 is well designed. Have they cared for the leather interior, is the skid plate bent, is there lots of rust underneath, does the transmission fluid smell burnt - there's so much you can tell about the care of an H2 in the first 15 minutes.
I've seen 6.0s go 300,000 miles without overhaul. However, replacing transmissions, differentials, transfer cases, and electrical problems can be expensive, but with the depreciation eaten on a used H2, you can afford to put some money into them. My H2 has been trouble free (except for two windshields from rocks) - knock on wood!