I load mine on the back under its own power. I do use some throttle and just slip the clutch some. As it turns out, the width of my ramp actually squeezes on the tires just a touch, which means the bike will not fall over even with out being bolted down. If I where you, I would have someone help me load it and hold it the first time. Once it is in place, mark the spot on the ramps where the tire stops, and weld short vertical plates on either side the tire about 2 inches high. That way, it will stay in place, and you don't have to hold on to it, while you strap it down. I would also suggest making sure your jacks are down on the coach, so the coach can not shift with the weight and surprise you. If your coach has air bags, you could always dump the rear bags, (leave the front one up). That will lower the rear some and make your life easier. My bike weighs 640 lbs and I never have help.
One other thing I did. Since I custom built my own rack, I welded vertical supports that actually bolt onto the bike frame (HWY board mounts). This way I do not use any straps. Just 2 bolts tightened down and the bike is rigidly held to the rack.
pics start here:
http://s213.photobucket.com/user/Daveinet/media/PC800/DSC06906.jpg.html?sort=3&o=7