i saw your bikes on your owen trip, and was thinking that is a nice option. i have one of those beefy swing out, mounts that is great, but it is a little process to get out, and in the hitch.
u might think about installing some plusnuts, or nutserts?, into the framing. the upper frame is hvy duty - should have taken some pics and dimensions when i was at atc.
go
I was using a swing out set up. It was very heavy, awkward to take on and off and I had to swing it every time I needed to get into camper. The hitch mount also decreased my departure angle and would rub at times. Some people love the hitch mount and it works well for them. (I did just see a fellow at the bike shop in Bishop taking very detailed photos of my set up, as he was running a hitch mount swing and looking for other options.) I also frequently tow a boat, so having an open hitch is a must for me. The fork mount option is proving best for me so far. I can open the door for access to the camper and even get into my propane locker with out issues.
As for the plusnuts and inserts I'm unfamiliar with their capacity numbers, but I feel a rivet is as good or stronger and are a simpler installation. The 1/4" rivet has a tension rating of #560 and a shear rating of #460. These numbers are doubled as I used two per mount.