I love seasonal campsites so much that I lease two of them! We have the "big house" and the "guest quarters" on adjacent sites at Smith Mountain Lake (VA). We also lease a boat slip - $6,000 total for the who season and we do at least 2 weeks vacation there and camp another 60+ nights. The guest quarters are not used as often as they were before my brother-in-law died but it sure is nice to be able to afford that luxury.
We also have a class B that we tool around in during the off season and for special events during the camping season. The last time we took that out was Thanksgiving...seems this winter brought either bad health or bad weather most every weekend we weren't booked with something.