Route Bridgeport CT to Liberty Harbor Marina & RV Park, NJ

The low bridges on the Garden State are South of the exit for I-78 East. The lowest bridge I know of is at mp 135 Southbound and is marked at 12' 4" at the shoulder. The Parkway restriction is 13' 6".

I95 to I-287, over the Tappan Zee to the Garden State Parkway to I-78 East. That becomes the NJ Turnpike Extension. The campground website has directions from there. You do travel a mile or two in a crowded, city area, but it is do able.