We've got a 2010 27ft Sprinter. I have done lots of projects on it. Mostly cabinets and trim but wiring as well. We take it out 8-10 times a year.
It weighs 6900 empty. I'm guessing closer to 1500lbs of crap in it. Call it 8500lb loaded. I tow it with a 2014 1/2 ton Silverado with the 5.3l V8. It's rated for 9500lbs towing. Given that I load up the bed with firewood, chairs and a cooler I'm probably right at rated load.
I've towed it over 8,000 ft passes in 100 deg heat. But to keep the temp gauge steady I slowed to 30 mph with the AC off. Normal driving is issue free.
We would consider an upgrade but I have a hard limit on 30ft hitch to bumper. I just don't want to deal with anything longer than that. We have always managed to park it but some spots were very difficult. So far anything at that length (or shorter) isn't any better than what we currently have.