We carried a scooter on the rear of our motorhome. It was 23ft long. We had an attachment welded to each frame member so that we had the trailer hitch plus a attachment on each side for a total of three connection points.
The issue is how much over hang behind the rear tires. How much leverage the extra weight of the scooter exerts.
Our experience: Scooter and scooter carrier weight about 500lbs
W/o scooter: Front axle - 3750 Rear axle - 6800 Total: 10600 lbs
With scooter: Front axle - 3400 Rear axle - 7700 Total: 11100 lbs
With the smaller motorhome we had capacity on the rear axle for the additional weight. If you have a larger class c which is near carrying capacity the scooter will add way to much weight to the rear axle.
Our unit drove fine with the scooter on the back. Actually was smoother ride and no handling issues.
Loading and unloading the scooter was not too bad...just took a little practice. We would start the engine and power the scooter up the ramp while standing beside it.
You may also have to worry about clearance (dragging). Our motorhomes trailer hitch was pretty high so there wasn't a problem with the scooter carrier dragging when we encountered dips like you have going into a gas station or something like that.
