I have a fabricated setup similar to fj12ryder, and got my idea from him based on his pics. I did mine cheaper however by using Harbor Frieght motorcycle stands (less than $70 each), not the chocks. The stands have a wider stance than the chocks and have built in tie rings. I bought a piece of aluminum angle from the metal yard and fit it between and attached it to the two front d-rings. I attached the two stands to the angle and so far so good. It's a fast set-up and take down once the bikes are unloaded. My next fabrication will be an electric winch set up to winch my bikes in when I have a steep angle on the ramp. Lighter bikes go in ok but heavier ones require someone pushing at the rear as you power it up the ramp, or the rear wheel spins and the bikes starts going sideways, not fun and always intimidating.
http://www.harborfreight.com/motorcycle-stand-wheel-chock-97841.html
Good luck.