I have a Thule T2 and I have had some welding done to strengthen my RV hitch. It did have a lot of "spring" in it. Anyway, back to the subject, the T2 has a pin that is used to double lock the "pivot" mechanism. Also, the Thule, like most bike racks that are hitch mounted, claim they are not for RV use (Kuat & Saris).
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