When campgrounds advertise site dimensions like “40-foot sites” or “big rig friendly,” they’re not necessarily measuring what you think they are. Some campgrounds measure from the electrical hookup to the back of the site, others measure the paved pad length, and some include the fire ring area in their calculations. There’s no industry standard for how site size gets determined.
This inconsistency means a “40-foot site” at one park might actually accommodate a 45-foot rig with room to spare, while a different park’s “40-foot site” feels cramped with a 35-foot RV. The issue gets worse when you factor in slide-outs, which need clearance space that may or may not be included in the advertised dimensions.
Experienced RVers often ask specific questions when making reservations: “How much space is there from the hookups to the back boundary?” or “Will a 38-foot motorhome with two slides fit comfortably?” Many campground staff can give you the real usable space measurements if you ask directly, rather than relying on the generic size categories listed online.
For popular destinations, it’s worth checking recent photos on campground review sites or RV forums, where other owners often post pictures showing how their specific RV fits on particular sites. This gives you a much better sense of real-world space than the official campground measurements.