Fit & clearance checker
Will your rig clear that road, garage, or campsite?
RV trip-ruining clearance surprises happen at three places: famous-but-narrow National Park roads (Going-to-the-Sun is 21 ft max — your 28 ft Class C is not getting through), low Northeast bridge corridors (11-12 ft posted clearances peppered through NY/PA/CT), and your own garage when you bring the rig home. This tool checks all three with one form. Paste your rig dimensions, pick from a curated US constraint list, or add custom constraints from the road sign you just photographed.
Your rig dimensions
Pick constraints to check
Add a custom constraint
Verdict
Glacier NP — Going-to-the-Sun Road
L 28 ft exceeds limit 21 ft (7.0 ft over) · H 11 ft exceeds limit 10 ft (1.0 ft over) · W 8.5 ft exceeds limit 8 ft (0.5 ft over)
US Interstate — federal min overpass clearance
H 11 ft ≤ 16 ft (5.0 ft slack)
Residential 2-car garage door
H 11 ft exceeds limit 7 ft (4.0 ft over) · W 8.5 ft ≤ 16 ft (7.5 ft slack)
FAQ
Where do the preset constraints come from?+
The NPS road limits cite the park's published vehicle-restriction pages (nps.gov/{slug}). Overpass / bridge floors cite FHWA 23 CFR 625 (federal interstate floor of 16 ft) and AASHTO Green Book minimums for state secondary routes. We do not promise every road in a state is at the floor — many are lower. ALWAYS believe the posted sign over our preset.
What does 'warn' mean vs 'fail'?+
PASS = your dim is below the limit with at least 6 inches of slack. WARN = within 6 inches — you'll fit but mirror-tucking and a spotter are essential. FAIL = your dim exceeds the limit; do not attempt.
Why is width sometimes missing on a preset?+
Many NPS road advisories publish a length limit but no width limit (the road is wide enough for any street-legal RV). When width is undefined for a constraint, the checker passes any width — the length / height limits remain enforced.
How accurate is 'mirror-folded width'?+
Manufacturer-published width is typically body-only. Most Class A motorhomes add 8-14 inches per side with mirrors deployed. For tight passages, mirror-fold and re-measure — the cleanest 102 in body can become 124 in mirror-out.
Keep planning
Trip planner
Multi-stop route + pack list builder.
True trip cost
Itemized total before checkout.
Insurance, explained
What's included by default, what's added at checkout.
Tow fitment matrix
Truck-to-trailer fit by GVWR / GCWR / tongue weight.
National parks RV guide
Per-park RV length limits and loop guides.