I have never had one but do know a few that do.
Most of those have it on their wifes wing.
If you can afford a used or new Trike, you would be better off in many ways.
I have a 06 GW Champion trike and we love it.
one my friends had to amek his dad goto a trike years ago His Dad Had Goldwings as long as I can remeber but when he got up in age they had to make him stop riding....he refused.....they found him a deal that went under the wing and when you came to a stop it would put 2 wheeels down and when you take off they would retract...great setup and a ton less than a trike...