The average maximum length permitted is 27 ft, but some parks can accommodate up to 40 feet in length. There are no electrical or water hookups at campsites. Some parks may have dump stations. You should check with your favorite parks for their specific maximum lengths so you won't be disappointed when you arrive. Lodging In-park lodges are administered by individual concession contracts.
Contractors operate individual reservation systems.
Check the park homepage for specific lodging information.