Where is the best place to buy the hitch receiver for a bike rack? I've seen it and its got a curved beam that mounts to the rear of the BH. The curve provides clearence for the bikes to hang off the back without interfering with the coach. I believe the guy that had one on his new BH 3570 picked his up directly at the Heartland factory in Elkhart, IN. He said he only paid $150. Has anyone ordered one from the factory?