I've gotten a little resistance from RV parks in the San Francisco
Bay Area to allowing my '84 Westy overnight.  Several parks have
asked, "Is that a self-contained RV?"  What they mean is: Does it
have a toilet?  Even parks with showers have been hesitant to let me in.

In the end, they have allowed me in, saying they'll break or bend the rules.

I don't have much experience, but I assume this happens more often at
RV parks that cater primarily to long-term mobile home tenants.  In
the Bay Area, it seems that's all there is.  I haven't yet found a
state park or RV-oriented park that's close to the peninsula or the east bay.

Is this resistance common in other areas?