RV parks is iffy, some won’t even allow DIY Van conversions because they are not built in a RV factory. So you have to call ahead and ask if they allow cars. Example was The Bearded Tesla just took a trip to the Key West and at one of the RV resorts, they were very rude and told him to get the F... out! So it’s best to call ahead and ask.
Wow!! Haven't run into that!! Been turned away due to being full - but rarely. Then again, I have never over-nighted and most RV Parks have vacancies during the daytime. After all, just need a couple hours - so extra profit for the Park. One slot - RV leaves, Tesla charges, new RV arrives. Just fillin' in the dead space.
Smart Park would put in a few outlet parking spaces (less room, minimum cost) and advertise.