No... There are campgrounds/parks, often older private or state parks, that do have fairly short length limits, but they're definitely in the minority. Many parks may have length restrictions on specific sites, but rarely on all of them. On the other hand, those of us with with 45' Class A's towing a 24' enclosed trailer may find our options more limited than those of us with the more common 30'-40' rigs towing a car.