I have a 2013 Class B+ on a Sprinter Chassis with an 11000 pound GVW. I am considering towing a car on a car dolly. The car and the dolly weigh about 4000 pounds.. I have a 5000 pound hitch. I am ...
If fully laden you will be at the max combined weight rating for the RV. If you stick around the lowlands you'll be OK but I personally wouldn't want to be doing any serious climbing like that. My toad weighs under 3000 lbs and I feel it back there when I'm pulling it. I am still overtaking the semis when climbing. That being said I do know of people that tow as heavy as you are suggesting with a Sprinter RV and they are fine with it.