I would not think that it is much of a problem in static weight, but more of a problem when braking or accelerating. If we eliminate the acceleration (how fast can you accelerate?) You have braking. The law of physics comes in play "an object in motion want to stay in motion and an object at rest wants to remain at rest" My own paraphrase.
If you are adding brakes then I think you have over come that.
Personally when I tow something the receiver excesses it's capacity, the hitch accessed that capacity and the chassis excesses that capacity.
So what I would definitely check into is the capacity of the frame of the motor home.
