Around where we live all the private campgrounds have a large contingent of "seasonal" campers who rent their sites from spring 'till fall and usually store their trailers on site. Lots have decks, etc.and are really used as cottages. These campgrounds also have some transient sites, but could not survive on that alone. The nicest ones have a waiting list for seasonal sites, May to end of October, usually. The Ontario Provincial Parks have a limit of about 3 consecutive weeks, I think, but they are also quite pricey for hydro only, somewhere around $35 per night! I was surprised on our last trip when we stayed a few nights at a St. Lawrence River Parks Commission campground to see that they did have some seasonal sites, (again people had built decks, etc,) and that is a government park.
Tina & Ted & pooches
2012 Ford F-150 XLT 5.0L V8 4x4 with tow package
Andersen WD hitch with sway prevention
2012 Rockwood UltraLite 2304s trailer