I have a Sierra Ultra Light with the backpack add on, part of which is a fold rack to haul stuff on. I modified the rack and welded an bumper receiver to it and haul our bikes that way.
A friend of hours just bought a new TT made by Forest River. It came with a bike rack that attaches to a factory installed mount on the rear bumper.
Before you actually haul any bikes for any distance, make sure that everything is secure and there is no twist in the bumper. I tested mine by jumping up and down on the bottom of the rack to see if anything flexed or moved. I think this was a fair test since I weigh more than the weight rating for the bike rack.
