How much Load/weight can a BB Motorhome pull?

Hey all, was curious if anyone has any experience, or knows someone who has towed a car on a trailer, or just a plain old flatbed trailer behind a Motor-home w./ a BB Mopar motor in it? One motorhome is 20' in length and the other is 28' in length...

Would be using a 727-B also, so if there are any modifications such as better Sprags, clutches, steels, or what have you, that would help it be more durable, and run cooler? Would anyone advise running an engine oil cooler as well as a H.D. tranny cooler too? I'd sure appreciate hearing from you all !:) Thanks in advance! ;)
Author: B-5