Maybe some "definitions" are in order at this point?
i.e.:
1. What is a Mobile Home park?
2. What is a Recreational Vehicle park?
3. What is a Campground?
IMHO, 1. and 2. appear to be getting really mixed up lately whenever we're out and about for recreation in our Recreational Vehicle - whether it be weekends or during the week.
I know it's probably expensive to have signs repainted ... but it sure would be helpful to us if many of the "RV Parks" would change their signage to read "Mobile Home Park" so that we would not waste our time pulling in to register for a night or two or three, only to be frustrated with no sites available. :)