What counts as a big rig
The usual line is 40 feet. Most Class A motorhomes run 36 to 45 feet, large fifth wheels 38 to 44 feet, and either one adds a towed car or a truck. Once you pass 40 feet, the number of campsites that fit you drops sharply: a majority of national park campground sites max out at 30 to 35 feet, many state park loops were laid out in the 1960s for 25-foot trailers, and older private parks have sites that technically measure 45 feet but include the utility pedestal in that number. The big rig friendly category on this site lists parks that report a maximum length of 40 feet or more, and you can narrow it by state, for example big rig parks in Texas.
Reading site lengths correctly
A site length on a reservation page is the length of the pad or the distance between the site markers, not the length of rig that fits comfortably. Three questions decide whether a number works for you:
- Does the toad or truck count? On a back-in site, you unhook and park the car elsewhere (ask where; some parks charge for a second vehicle). On a pull-through, you want the whole combination to fit so you can stay hitched for a one-night stop. A 45-foot coach plus a car needs a 65- to 70-foot pull-through.
- Where is the pedestal?The electric and sewer connections sit at a fixed point, usually the rear third of the site on the driver's side. If your utilities are mid-coach, a site that is long enough on paper may leave your sewer outlet 20 feet from the inlet.
- Is there room for slides and the awning?A rig with 3-foot slides on both sides needs a pad width of at least 14 to 16 feet plus clearance for the door-side awning. Parks built before the slide era often put picnic tables, trees, or the neighbor's pedestal exactly where your slide goes.
Pull-throughs vs back-ins
Pull-through sites cost $5 to $15 more per night at most private parks and are worth it for overnight stops on a road trip. For stays of several days, back-ins are often larger, quieter, and sit on the outside of the loop with a view. Backing a 40-footer is a skill you should practice in an empty lot before you need it with an audience; a spotter on a walkie-talkie or phone helps more than any camera.
The approach matters as much as the site
The park itself may be fine while the last mile is not. Before you commit, check:
- Road width and turning radius. A 45-foot coach needs about 45 to 50 feet of swing to make a 90-degree turn. Interior campground roads narrower than 16 feet, tight one-way loops with rock borders, and hairpin switchbacks on the way in are the common problems. Satellite view on Google Maps shows loop geometry surprisingly well.
- Overhead clearance. Most Class A rigs run 12 feet 6 inches to 13 feet 6 inches tall. Low branches scrape roof air conditioners and satellite domes; older wooded parks in the East and Pacific Northwest are the usual offenders. Look for a park that says it trims to 14 feet, and note any low bridges, gas station canopies, and tunnels on the route. RV-specific GPS (Garmin RV series, RV LIFE Trip Wizard, or the CoPilot RV app) route around posted low clearances if you enter your height correctly.
- Grades and dips. Long overhangs bottom out on steep driveway aprons. Reviews that mention scraping are a red flag.
- Weight limits. A loaded diesel pusher weighs 30,000 to 50,000 pounds. Posted bridge limits on county roads are real, and some forest service campground roads are limited to 10 tons.
Satellite and Starlink clearance
If you rely on a roof satellite dish or a Starlink dish for TV or remote work, tree cover is a site-selection issue, not just a shade issue. Satellite TV needs a clear view to the southern sky at roughly 30 to 50 degrees elevation depending on your latitude. Starlink needs an open view mostly to the north at 25 degrees and above in the continental United States. Ask for an "open" or "sunny" site, or use the Starlink app's obstruction checker on arrival before you unhook. Many desert parks in Arizona advertise satellite-friendly sites for exactly this reason.
Questions to ask when booking
Call the park, not just the reservation portal. Ask these in order and you will know within two minutes whether they actually host big rigs:
- What is the usable pad length on the site you are giving me, and is the pedestal inside that number?
- Is it a pull-through, and can I stay hitched with a 20-foot toad?
- Is the site 50-amp? (A 40-foot coach with two or three A/C units needs it; see our 30 vs 50 amp guide.)
- How wide is the pad, and is there room for slides on both sides and the awning?
- Is the site paved, gravel, or grass? Grass sites in wet weather can bury a 40,000-pound coach to the axles.
- Any low branches or tight turns on the way to the site? Which entrance should I use?
- Is it level? Big rigs with hydraulic jacks handle a few inches, but an 8-inch side-to-side slope is a problem.
- Can you email me a photo of the site or point me to the site number on a map?
Where big rigs are easy
Newer RV resorts in Florida, Arizona, and Texas are built around 45-foot coaches with concrete pads 70 feet or longer. KOA Journey parks along the interstates are designed for one-night pull-throughs; KOAlists pull-through lengths on every site. Corps of Engineers campgrounds are often surprisingly roomy, with many sites over 50 feet. Casino RV lots, Cracker Barrel, and Cabela's are dependable overnight options when you only need a big flat lot. For scenic public campgrounds, filter reservations on Recreation.gov by "driveway length" and read the fine print; the number is usually accurate, but the road to reach it is not described.
Start with the big rig friendly hub, then read recent reviews for the words "tight," "branches," and "scraped." Our guide on what to look for in RV park reviews covers the rest.
Frequently asked questions
What length RV is considered a big rig?
Most campgrounds and directories use 40 feet as the threshold. Above that, site availability drops sharply, especially at national and state park campgrounds where many sites max out around 30 to 35 feet.
Can a 45-foot motorhome fit in national park campgrounds?
A few loops in parks such as Yellowstone (Fishing Bridge RV Park), Grand Canyon (Trailer Village), Zion (Watchman), and Yosemite (Lower Pines, select sites) accept rigs of 40 feet or more. Most others do not. Check Recreation.gov site details for the driveway length and book months ahead.
Is a pull-through site always better for a big rig?
For a one-night stop, yes, because you can stay hitched. For longer stays, back-in sites are often wider, quieter, and have better views. A well-designed back-in with a wide approach road is easier than a cramped pull-through.
How wide does a campground road need to be for a Class A?
Around 16 feet on straight sections and considerably more on curves. The bigger issue is the turning radius: a 45-foot coach needs roughly 45 to 50 feet of swing room to make a 90-degree turn without the tail sweeping into obstacles.