Tell us about yourself!
I don't know about towing one with a 400cc scooter, but years ago I built a teardrop I towed behind my Harley Davidson Electra Glide and loved it. You just have to be sure you get a full motion hitch for a motorcycle.
Kind of off subject, but you mentioned your RB is kind of buggy. Have you checked out our Google Group for RigidBots? It is a marvelous gathering of RB enthusiasts and you could definitely get help in killing the bugs.https://plus.google.com/communities/117996416225488251038