8afb9248_s___United_States_Access_Board_l_Costs_for_Camping_Facilities_Camping_Facility_Elements
[Final Rule] With proper design and lay-out of the vehicle spur and camping unit pad in camping units with mobility features, parking spaces 20 feet wide can be provided for recreational vehicles without increasing the size of the vehicle spur and camping unit pad beyond what is specified in the baseline guidelines and standards for the design of camping facilities. [Camping Facility Elements] 
Parking spaces provided for recreational vehicles within camping units with mobility features
Regulatory Assessment of the Final Guidelines - United States Access Board
Camping Facility Elements