My 1 Ton ( single rear axle ) can pull over 20000lbs . No problem . But the thing is your hitch has to be able to handle that weight. My 5th wheel hitch is an automatic slider able to handle 16000 or maybe 15000lbs . If I wanted to pull more I would have to get a much larger hitch . The truck itself has the power to pull 20000 lbs no problem .While half tons are plenty capable in work and play, you can't compare one with a 3/4 or full ton truck. I think my towing capacity on the Tundra with my configuration tows like 9,900lbs. or something. When you take a Dodge 3500 dually diesel (which is a lot of truck) I think it's close to 22000lbs! I could be off a touch on numbers, this is from memory, but WTF, more than double? Seriously? Now, realistically I would never have to tow this much, it would nice to be able to tow what I need with confidence.
Even if your not going to pull the maximum weight , it's always nice to have the extra power and towing capacity for safety on the highway .
My RV trailer weights 10,000lbs empty . When I go up North it's packed for 14 days of dry camping . So I have to bring everything that's needed . Nearest store is 150k back to town. Behind the RV I hook my 16ft boat and trailer . The boat is even loaded with stuff . You can never bring too much when your camping 150k out in the middle of nowhere . The big Dodge pulls everything . Used to use my 3/4 ton ( Dodge diesel) for that which was fine as well .
Going up the hill in North Bay or New Liskeard is no problem . Just hit the fuel peddle and away you go .
Gotta love that Jake Brake on the Dodge . Works really well going down hills and on the highway . Saves on my truck brakes and trailer brakes which are expensive to replace .