I have an 160K mile 02 suburban with the 8.1 and it's a beast. Only issue I've had that I didn't cause myself was a rusted out break line. I've sheared teeth on the rear axle, and I have a bent frame at the trailer hitch (not my fault, loader operator decided to pack down the dump trailer by lifting his front wheels off the ground with his bucket on the trailer) I have had 14K behind her before and she handled it (10 miles most across city).
Watch oil consumption
Give her regular maintenance
Give her a good once over at "problem areas" occasionally and I bet you'd be fine for a long time.
Watch oil consumption
Give her regular maintenance
Give her a good once over at "problem areas" occasionally and I bet you'd be fine for a long time.