Camping grounds are to be used exclusively for recreation, vacation or travel purposes. Campgrounds may contain cabins, A-frames and other similar structures, as well as travel trailers, pickup coaches, motor homes, camping trailers, recreational vehicles and tents suitable for temporary habitation. No permanent external appurtenances, such as carports, cabanas or patios, may be attached to any travel trailer or other vehicular accommodation parked in a camping ground. The removal of wheels and the placement of a unit on a foundation in a camping ground is prohibited. No travel trailer or recreational vehicle in excess of 50 feet in length shall be permitted in any camping ground.