I have a '07 2500HD with a 6.0 L gas and it pulls 10000 lb loads over the Coquihalla well, about 335000 km now.
I have a 2001 Silverado 2500HD, 160,000. km, 4x4, 6.0 gas, manual 5 speed overdrive transmission, an actual transfer case, and an extended cab with a full 8 foot box, duel batteries and a huge factory internal fuel tank. It is a good work and camper truck (8 foot box and there seems to less and less of those available) and a very reliable bush truck. It can seat 6 people as it has a fold up cheater seat under the front center console.
What makes it a great bush truck compared to modern trucks is that it is not loaded up with all sorts of crap that can fail in the field and is easy to repair in the field. It does not have a couple of hundred computer sensors and other than power steering and brakes, everything is mechanical and far more failure resistant. No keyless entry power door locks or power seats, windows etc. to fail. Modern complex, hyper expensive, auto transmissions with integrated electronic controlled 4x4 systems are not something I want to put my faith in a 100 miles deep in the bush up a 16 mile 4x4 trail. Give me a mechanical manual shift transfer case any day.
What it does have is a 10,000 lb Warn winch on a heavy huge welded steel walk on bush guard bumper with rap under skid plate to protect the radiator and front end and underside skid plates to protect things like the transfer case. That bumper gives you lots of places to use your Jack-All on, if needed. It is to bad they do not make heavy, basic, reliable trucks like this any more. City drivers like the luxury status features on the modern trucks and I know the dealers like them as they make a small fortune running codes and fixing all those complex systems. My older gas Silverado may not get great fuel economy but its over all operating and repair costs are still low without all the ultra expensive crap built into it to service and repair. Should my 7000lb truck with heavy bush guard, heavy HD frame all steel truck meet one of those new half aluminum light weight (for better fuel economy) trucks in an unfortunate way, they will lose.
I have also noticed trucks like this especially, body rust free, with low mileage seem to be in demand, hold their value and a few weeks ago someone left a note on the windshield with their info asking If I want to sell it. Which I expect I will sometime in the next couple of years.