New Jersey

Try Cape May area.

Plenty in cape May county. Most are within a few miles of beaches and several wineries.
Some of the RV parks are basic and clean... Just a place to spend the night and then go see the sights, as opposed to places you would go to hang out on site all day
I'm down there about 6 to 8 weekends per summer at my moms beach house, and I'd be happy to guide you in detail about the area

Cape May. Beachcomber is nice and near everything. Sunset Beach is only minutes away, and dogs ARE allowed.

Cape May as others stated unless you are planning to visit another area of Jersey shore.

X2 on Cape May County

We like Holly Shores and dogs are welcome.

on our way back from the outerbanks last week we stopped in cape may for a couple nights. We stayed at the KOA, the site was big, but I wasn't excited about the rest of the campground, it wasn't bad, the pool was ok at best. We did visit holly shores down the road and liked the place for its facilities, campsites were short though. As for the rest of the area, just not my thing, cape may is over priced and wildwood is a zoo.

There are many campgrounds along Rt 9 south of Atlantic City. If you want to go to traditional boardwalk type of town, then you might want to go to Ocean City. Whipporwill campgrounds would be closest to this point. Stayed there many times. Nice, big sites.
If you want to go further South towards Sea Isle or Avalon, then Avalon campground would be my recommendation. Small cute park.
Next point going South would be Stone Harbor and Wildwood. Seashore campsites and Big timberlake campground are nice parks near this area.
Furthest point South is of course Cape May. Beachcomber, Holly Lakes are both nice campgrounds in this area.
We have stayed in all these campgrounds. All are nice. Just depends which part of the Jersey shore you want to go to.