The thread discussing Axle Loadings is interesting. The biggest problem with mounting a motorcycle/scooter on a rear-mounted rack arises out of the distance of the mounting from the axle, due to the long overhangs of motor homes. Not only does it impose greater effective loading on the rear axle, but also creates greater side forces - or yawing. Is there any legal reason why a rack should not be positioned on the front of a motorhome? I knew a chap, once, who had converted a Mercedes Unimog into a motorhome for travelling across Africa. He had mounted a motorcycle on what was, in effect, a hydraulic fork-lift, on the front of the vehicle. Very effective and helped to deal with axle loadings. Given the very short overhang on the front, this would seem to be a possible solution.