I am looking for a Dual Hitch Receiver to haul bikes between my tow vehicle and our travel trailer. The only one I can seem to find is one rated for 4000 lbs. They must make one that is rated for a higher towing weight. The dry weight of the travel trailer is 5000 lbs. Does anybody know of a manufacturer that produces a dual hitch receiver rated higher than 4000 lbs? Thanks for the help.