The Isuzu/GM line of cabovers. Isuzu labels em NPRs, GM just calls them W3500/4500. I am looking at 00+ models and specifically an 02 gas truck. They generally sport an auto transmission that I assume is a 4L80e and either a GM gas smallblock or a little 4cyl diesel. I know everything there is to know about the GM gas burners but nothing about the diesels these trucks featured. I assume they are also mated to the 4L80? Adequate power? Can they do interstate speed comfortably or is it running with its tongue out? Are there any problem areas with the truck? I know the GM power plant is bullet proof but I don't know anything about the rest of the truck or the diesel engine. I'm going to have a small dump bed on it that wont see much more than 2,000lbs in it. Usually it'll be empty or just have some grass clippings or leaves in it. I am positive the truck is well above that task, but 99% of its duty will be hauling my lawnmower trailer which is a tandem axle unit and weighs <4,000lbs loaded including the trailer. I have never seen one of these trucks tow anything. Ever. Considering its #1 job is going to be towing, is it a suitable candidate? These trucks seem inexpensive for what they are, only come in the cab configuration I want in the color I want and are generally wholesaled cheap as dirt with reasonable miles unlike the standard pickup truck market. The only snag I see with this truck is it is extremely rare to see a 4wd one and they look top heavy as all ****. I don't really want to buy one of these in that trim, but I think I can get by with a locked rear end. I'm not familiar with what make or size the rear end is on these trucks but is there an aftermarket for a locker/posi unit? What gear ratio do these usually run?