We have a 2001 2500HD reg cab with the 6.0 w/4.11 rear. We bought it used with 21k and it now has 33k.
It has been a good truck. I'm glad to hear that others are having good luck with the motor as we rarely use it as a daily driver. Made the mistake of letting the truck sit in the barn to much and had to turn the rotors turned and replace the rear calipers. A good friend (ex V 20 owner) and master tech for GM scolled the hell out of me for not driving the truck. Told me I was doing more harm then good letting it sit.
The truck is thirsty but it pulls our Rosborough pretty darn well. We towed the Rosborough up into the mountains of upstate NY going to Lake Champlain last summer. That is when I thought having a diesel would be nice.