I modified the airplane trailer to carry the bike, cutting the outside "wings" and bringing in the Harley Fat Boy billet wheels. I got aluminum non skid plate to make a floor, and made an 8 foot ramp with a wheel chuck for the bike to fit on:
The thicker aluminum loading ramp is hinged, and pulls up tight against the rear wheel of the bike with a tie down to keep it from rolling back:

The bracket holding the shocks will have to be braced by a 1" x1" tube welded at 45 degrees.