Answer
Do not plan to park or sleep in an RV on Ocean City, Maryland streets overnight. Large vehicles face limited curb space, height and length friction, and Town overnight / parking rules that favor campgrounds designed for RVs.
Day trips onto the island work better with a toad, SUV, or municipal bus after you leave the rig at a mainland park. Oversized vehicles also struggle in many hotel garages.
Confirm Town parking rules before any curb experiment, and see Parking & Transport FAQ plus Transportation for car-light Boardwalk days.
Sources: Town of Ocean City · Visit Ocean City
Editorial visitor guidance for Ocean City, Maryland. Confirm current Town of Ocean City, Maryland DNR, NPS Assateague, and NWS rules when regulations or safety apply.
