I would recommend a single ground point. That's how I have the shack at home. Then you could run a ground lead to the local water pipe as suggested. Perhaps run a ground lead for the entire frame of the RV??
Also, what are you using for ground leads? RFI likes to run only on the surface of a conductor, therefore you need something like braided coaxial sheild that has lots of surface area, or maybe 1 in wide copper strap.
Just some thoughts.
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