Jim/Kathy,
I know of a couple possibilities. The nicest place in the southern NC shores is probably Holiday Travel Park in Emerald Isle. It's beachfront. They have very nice seasonal sites, as well as
www.htpresort.com. I've stayed there several times (not seasonal).
Also, there's the Outer Banks (northern NC islands off the coast), but since we're not seasonal people, most of our stays have been for weekends. The nicest place is
www.camphatteras.com but not sure what they offer for longer term. I know that there is a storage place across the street that drops the rig off for weekenders, but they also do long term storage for what you're after. Camp Hatteras is also beachfront (most of the Outer Banks places are --- it's not a very wide island(s).