Bike Rack Questions-- Again

we took an idea from a camping friend. we have a bike rack for 4 bikes that goes into a hitch. we had a sheet metal shop make a custom plate with a receiver hitch mounted on it, the plate is then attached to the fifth wheel hitch on the trailer. the bikes ride in front of the trailer. a family that we camp with has 4 kids. they have 4 bikes on the 5er hitch rack and 2 bikes on a roof rack on the truck, along with 2 kayaks, and the rest of the kayaks inside the trailer. I don't have a close-up picture of the bracket that is on the truck. bikes will go on this coming weekend, if you are interested I can take pictures and post them in a week.