We put our rig in a storage facility that specializes in RVs, boats and some vintage autos that people won't run in the winter. It's a large warehouse surrounded by a parking area with a barb wired fence. The fence has a gate that opens with a clicker that you get when you rent your spot.
When I want my RV stored, I call them the day before to tell them I'm dropping it off. I drive into the fenced area and drop it off. They move it into the warehouse. I don't have access to work on it or futz with it inside. If I want to do anything, they'll bring it outside for me. When I want to take it out for a trip, I call the day before and they move it out and have it waiting for me whenever I get there to take it. When I go and get the RV they will store my car inside the warehouse until I get back, so I know my car is safe, too.
They charge by the foot for storage (20-25ft long X amount, 25-30ft X+ amount, etc). The have ala cart storage where you pay just for storage but if you want them to wash it, or fill the water tanks, or empty the black tank they will charge you a small fee. Then there is the "full service" rental where they clean and prep it before you go out and after you return.
