Hi Lee,
I just went through a similar exercise as you. I have a motorcycle I want to take with me along with my toad, which was a Grand Vitara. My current bike only weighs 350lbs but putting it on the back of my coach with a 70lb ramp would add 650lbs to the rear axle. I only have 600lbs left right now. Once I realized I most likely would be getting a slightly larger bike, weighing around 570lbs, the ramp on the coach was out. Knowing triple towing is not legal anywhere in the east where we spend most of our time I traded the GV for a Dakota pickup. Now I can take both toys and still be legal. There is a guy here at TGO that carries two ATVs on his pickup. He loads them from the side with a ramp. Guess it places them awfully high but he's done OK so far.