Depends on what you want to use it for. As @zolman stated a small moped/scooter won't suffice for highways. I actually have a Yamaha XT250 and have hauled it on the back of our PC; you obviously need to have a motorcycle license (and experience) to ride one. Loading/unloading a 300lb. motorcycle can be a bit formidable unless one opts for a (pretty $$$) lift rack. On the other hand, if you only want to ride around campgrounds or take shorter jaunts, ebikes (which we have also taken on our PC) might work very well for the task; they certainly have for us.