Adding Hitch for Bike carrier on rear??

I added a frame mounted cargo tray to our camper. When 100 pounds was added the tongue weight decreased by only 20 pounds or so. Don’t remember exactly, but was less than 25 pounds. I think that 4 bikes “could” reside there if loaded creatively.
The problem with most bike racks is the bounce from a receiver mount. Someone on this forum had a double receiver built for their trailer mounted to the frame.