I had the same problem. What it was, the bolts that hold the hitch to the motorhome had come loose and lost. I found this out when I looked in my mirror and my towed car was pulling out to pass me. The bolts holding the hitch did not have locknuts on them. I replaced all of bolts and nuts (with lock nuts), torqued them, and now I check them to make sure they are still there.
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