Hi edpick
Now I am not an expert but I do have quite a bit of experience. I would say your x9 is far to heavy to hang on the back of the Bailey. anything over 100kg and you find the front end of the motorhome will very light on the steering and you will probably be overweight on the rear axle. I know one or two people who have found this out to their cost.. We carry a PGO TREX 125cc and that weighs 110kg and that is on the back of a tag axle. Now I know the X9 is a great scooter as we have an X10 but unfortunately that stays at home because of the weight.. However, if you did not want to tow, I did see in France this year what was a rigid trailer on the back of a camper. This was connected with two tow hitches and therefore didn't articulate, but the wheels did! so when the guy reversed the unit just stayed straight. The guy was carrying an MP3 on it.. I have tried to search for this type of mounting on the internet but know luck so far.
Hope this helps
Spinner