My experience !!!!
Have a hitch welder to the frame.
We used a bumper mounted bike rack on our old TT it had the bikes and the spare tire all mounted to it. Well it didn't take long for the welds to crack on both sides and we about lost the entire thing. Luckily we were almost home when the people in the car next to use honking there horn at us and pointing to the back of our rig.
Some times you learn things the hard way.
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