I kinda wonder if that might be he doesn't want to deal with a pissed off RV owner yelling at him that a "car" is taking up a spot that was designed for an "RV" if someone showed up after you and the site was busy...
You have a point there. Could be. I was the only car in a sea of huge RVs. I think the one-off, small, family owned sites are the way to go. This one was a major RV place...kids running all over, pool, lots of facilities. Where we wound up felt more like camping.