Is the dish on the roof of the RV?
If so, is the dish an automatic signal finder? If the same coax was used in both places, and was not unhooked, the possibility that the elevation was a little off could be the culprit.
Or if the coax was unhooked then rehooked at the campground, possibly the center conductor was not making contact properly. I had a same situation on my last outing, I unhooked the coax then reseated it, and it came back to life.
Also, did you go through setup, on receiver at the new location? If so, the possibility that wrong dish setting may have occurred, ie round versus slimline, or vice versa.
Hope you find the answer, Kay