Here ya go Jerry...some options starting with the lift option:
Cruiserlift RV Motorcycle Lift System
Then there is the hitch/ramp option at about 1/6 the price but limited to 500 lb bike with the standard class 3 hitch.
Then there is the swivel wheel option for heavier bikes.
The ultimate single wheel trailer system.
I carry two 150cc ish scooters (roughly 550 lbs) on the back of my Georgetown on a dual cycle carrier which can carry 600lbs. but I had the class 3 hitch removed and replaced with a class 4 and everything has worked great. One thing I would note is to get the LONGEST ramp with any carrier you can as it makes it easier to roll the bikes up and on. I had joehauler.com make my carrier and am very pleased with his quality and his hitch stabilzer system. He also has lots of pre-made units to fit your individual needs.
Some pix here: Two Scoots...one G'town
Good luck and yell if I can help further.