Sounds like you should be looking at trading the 5th wheel in for a Toy Hauler unit. A number of these rigs available, and when the Harley isn't brought along, you get a killer patio addition to your living space.
There are too many places where the total length limit of your rig (tow vehicle and trailer) cannot excede a certain length, along with not being allowed to two 2 trailer units. I do not know of any trailer or 5th wheel designed for the strength needed for any kind of lift mechanism.
Ken and Terry
2010 Georgetown 330TS being pushed by our
2017 GMC Terrain toad (4 wheels down)