The three we are going to look at offer 30amp, water, and sewer. The sights range from 20 by 40 to 30 by 60. What we have discovered is that many places we have called are a closed system. You can only get a seasonal if you buy one in place already or buy from their local dealer. Seems like a pretty good business model. However when we looked at the listings they were all park or destination that are never going to move they have all been skirted and have additions on them.
BTW all three campsites we are going to have used trailers for sale and a lot of people have suggested going used right out of the gate to save $$$ and to avoid new car bugs.