Some things to think about
:
I have used an older 4-bike version of this on a Coleman Utah:
Original 3 Towing Bike Rack- Swagman
which slips over the receiver bar. I stopped using it and went to a Pro Rack
ProRac Proformance Bike Rack | Tent Trailer Bike Rack |, which mounts to the tongue with just the back wheels on the trailer roof. I like this one much better.
We do a lot of long distance travel with overnight stops and the receiver mount tends to get in the way of hook-up/set-up. It also interfered with getting into the back of the car (Ford Explorer) during travel stops for lunches, etc. I also used it mounted to the back of the Coleman (yes with proper bracing/mount points) which worked okay except for the initial forgetting to realize it changed the trailer balance - a lot -.
The swagman rack used a jam bolt underneath to stabilize the rack, but there was still a lot of movement which led me to tie down the bikes to the car to keep it still. You may get some of that with this setup.
Don't forget it adds directly to the hitch weight you are putting on the tow vehicle.
I have not mounted the Pro-rack on our new trailer yet, but expect to do so this spring. That could prove to be an adventure since the tongue area on the FR pop up is covered with a metal plate (which already needed some mod for the WD hitch setup).
enjoy.