I agree, seems somewhat rough. Also, may sound nit picky, but I cannot stand when someone is selling something and they dont bother to clean it up at all. Unless it’s a 50 year old project with parts on the front seat.
One thing I’ll mention here that may be helpful. My BIL and sister have a vortec max with a 6.2 in a 1500. Their travel trailer is fairly light at under 5k empty. That truck really struggles on the grades out here. I have to slow down when we travel together and I’m almost exclusively towing our TT with my 2004 cummins/nv5600 now. Not exaclty a powerhouse by today’s standards. Then again, you may be towing something lighter and/or over flatter terrain than the Sierras and Inyos.
If it were me and I was only using it for those types of trips, I’d find something 8.1 if you wanted to stick with GM gas from that era. The mileage towing will be pretty close. If you need a “full” crew cab, a 3rd gen cummins can be a good family hauler. Not sure about the market for those out there though. If a regular extended cab is okay, a later 12v is pretty tough to beat.
Or a big block suburban squarebody or gmt400. I’m sure you can find one of those for $5-6k.