How RV Campsite Length Is Measured
Where the "maximum vehicle length" number on a campsite listing actually comes from, and why it varies so much between sites at the same campground.
Every campsite with vehicles in mind has a physical driveway, or "pad," carved out of the surrounding terrain. Its length is fixed by whatever's on either end — trees, a rock outcrop, a neighboring site, a utility box — and that's what "maximum vehicle length" describes: the longest vehicle that can physically park within the pad without hanging into the road, a neighboring site, or a fire ring.
Why it varies so much within one campground
Sites at the same campground can range enormously. Take Cades Cove Campground in the Great Smoky Mountains: its 4 nearby Smoky Mountains-area sites we track range up to 42 ft, but plenty are much shorter — older, historic loops were laid out decades before today's larger fifth-wheels and Class As existed. See the full site-by-site breakdown.
Who publishes the number
For federally managed campgrounds, the maximum length is set by the agency that manages the campground (National Park Service, U.S. Forest Service, Army Corps of Engineers, and others) and published through Recreation.gov's public reservation system — the same system you'd book through. RVFitFinder reads that same field directly via Recreation.gov's public RIDB API, rather than estimating from photos or averages.
What it doesn't tell you
Length isn't the whole picture. A site can be long enough but have a tight turning radius, low tree branches, or a steep grade that a length number alone won't reveal — always cross-check photos or call ahead for anything near your rig's limit.
FAQ
Does maximum vehicle length include slide-outs?
No — it’s a length measurement (front to back), not width. Slide-out clearance is a separate concern tied to how close neighboring sites and vegetation are, which length data doesn’t capture.
Why do some sites at the same campground have very different limits?
Campgrounds are often built in stages over decades, with older loops laid out for shorter trailers and newer loops designed with modern rigs in mind. The pad length is fixed by terrain and layout at the time it was built.
Does RVFitFinder verify these numbers itself, or just relay Recreation.gov’s data?
We relay Recreation.gov’s own published field for each site — the same number the campground uses in its own reservation system. We don’t independently measure sites, and we don’t round, average, or estimate when that field is missing.