Have you talked to the Campground? A lot of the campgrounds in South Jersey at the shore have storage lots for winter storage or weekend only seasonals (the campground moves the RV off the site so they can rent the site during the week). They might let you park it there.
Along Route 9, there aren't a lot of large businesses other than the campgrounds. There is a Walmart about 20 minute south in Rio Grande. If you wanted to visit the Cape May Zoo, you can park there for free, entrance to the zoo is free too.
-Michael
Michael Girardo
2017 Jayco Jayflight Bungalow 40BHQS Destination Trailer
2009 Jayco Greyhawk 31FS Class C Motorhome (previously owned)
2006 Rockwood Roo 233 Hybrid Travel Trailer (previously owned)
1995 Jayco Eagle 12KB pop-up (previously owned)