Towing a large vehicle

There seems to be a misconception about actual tow capacity and the receiver hitch capacity. The gas MHs use a fixed length frame, depending on wheel base, that the manufacture usually extends to carry the house part. The manufacture is the one that sets the tow limit, not the chassis manufacture. The tow limit has to be certified to tow the set amount of weight for DOT requirements. If you look under some of the MHs, there is really some god awful looking extensions. Most DPs have a hefty frame that the hitch is attached to. There are some that have had the rear extension modified to tow more weight, but to be legal, a certified engineer would have to sign off on the mod. I don't know of any that would do that.