This truck, like its brother the KW T300, is an excellent midsize truck, and has seen many great comments here on EO. Really the only troubles I have heard of with them are the cab is a bit snug, and a few isolated troubles with heater control valves. The early Cummins ISC's had some teething troubles with their fuel pumps, but that should be corrected by now with a 2000 model, and it is far superior as far as I am concerned to the parent bore CAT 3126, the only other engine offered for the truck. That teamed with the durable 10 speed non-sync should make for a very reliable ride, if the condition is good and the price is right. Have a mechanic friend go with you to really check it out.
-Weave-