We used to carry our 1985 Honda Elite 250cc on our Class C's rear hitch receiver. We had a custom carrier for the scooter which used an Acme gear drive to move the scooter up and down for easy loading and unloading. It worked really well. You could felt the weight when driving but my upgraded rear spring pack did a good job to compensate for it. A negative was it got pretty dirty back there with all the road dust the RV kicked up.
Eventually we went to hauling two maxi-scooters in an open utility trailer and this worked better. However, it still got pretty dirty with road dust etc. and of course, it was still susceptible to theft given the open trailer.
Finally, we bought a used, enclosed cargo trailer and I modified the inside with e-tracks to accommodate our two maxi's (Burgman 400 and Silverwing). We love this solution and pulling the 3,000 lb. trailer behind our set-up is no problem. We also get to carry a lot more gear (big campstove, loungers, outside tables, well equipped toolbox etc.) with the cargo trailer so we love this setup.