Anyone used a bike rack on the back of a towed on a dolly?

Here's the rack we're using: http://www.northshoreracks.com/photo%206bike21.htm

I called Demco they said there's no WAY that would work between the coach and the towed.

I've spent over 3 days researching racks, couplers, straps and so on. This is driving me INSANE.

i feel like i'm back to square one