We didn't want our nice bikes on the front of the truck, and wanted to keep our hitch for a step/tray, so I mounted appropriately sized Kuat Dirtbag fork mounts onto the rear wall of the camper (reinforced with a large 1/4" thick stainless plate):
https://www.kuat.com/product/dirtbag/
It's a bit finnicky getting the right mount alignment (you have to stagger the mounts vertically or your handlebars will conflict), but otherwise a no-brainer.
We remove the front wheels and keep them in the camper.
Works great.
