I have actually done mountain towing with my coach (see sig.), towing a Jeep Rubicon Unlimited (mildly modified; winch, custom bumpers, 30 gallon fuel tank, extra skid plates, etc.). I have no idea what the Jeep weighed, but I imagine it was well over 3000 lbs. I crossed the Continental Divide (Marias Pass, Hwy 2; Monida Pass, I-15; Homestake Pass, I-90) many times.
I towed the same Jeep with a 1995 Tioga Class C, E350 chassis, Ford 460 V8 engine. Again, over the Continental Divide.
I never had any problems.
