I realize this is a little far from Surf City, but there may be parking available at the Wilmington Airport. I know there are several self storage stores along Market Street and also a couple of RV dealerships on Market St in Wilmington just north of the end of I-40 (which turns into College). The last time I was in Hampstead there was at least one self storage that I remember, also on Market St. Market St is Hwy 17.
Dan Sees, , 2013 Winnebago Journey 42e, 2014 Featherlite Car Hauler 3110 17.5', 2008 Mazda MX5,
2008 Toyota FJ Cruiser,2018 mercedes Benz GLA 250