The exact walkthrough a professional RV inspector runs — in order, in 90 minutes. Frame, roof, plumbing, electrical, and appliances before you sign anything.
A professional RV inspector charges $200–$400 and is worth every penny — but most buyers skip it entirely, especially on private-party purchases where there's no dealer to push back against. This checklist is the walkthrough a certified inspector runs: frame to roof, plumbing to electrical, appliances to tires. It won't replace a professional with a moisture meter, but it will catch the things that cost thousands to fix before you sign anything.
Water damage is the variable that separates a solid used trailer from an expensive mistake. It starts at the roof — every seam, every penetration, every vent — and works down. By the time it shows up as a soft floor or a stained ceiling, it's been there for a while. The three-part check is: press the screwdriver handle into the floor near doors and windows, look up at the ceiling for any yellowing, and get on the roof and feel for soft spots. These three steps alone will flag the trailers worth walking away from.
A professional inspection costs $200–$400 and is worth every penny. But if you're standing in a seller's driveway — or just want to know what the inspector is looking at — this is the exact walkthrough they run. Work through it in order. Give yourself at least 90 minutes. Rushing this is how people buy someone else's problem.
Schedule on a sunny day
Natural light makes water stains, delamination, and roof cracks dramatically easier to spot.
Walk the entire rig slowly before touching anything. You're looking for the story the trailer tells before anyone starts selling it to you.
⚠ Dealbreaker Watch
Bubbling or rippled sidewalls are delamination — water has already gotten between the skin and the frame. Small patches can be repaired; large sections across a whole wall cannot be economically fixed.
Get low. This is where the most expensive surprises hide.
⚠ Dealbreaker Watch
A bent frame or cracked welds at structural points are walk-away conditions. These are not repairable to original spec.
Trailer tires fail more often than people expect — and almost always at highway speed.
Why Age Beats Looks
A trailer tire can look nearly new and still fail from UV and ozone degradation. Age is the real number — always check the DOT date. Sellers often don't know it and buyers almost never ask.
More RV damage comes from the roof than anywhere else. Water damage always starts here.
⚠ Dealbreaker Watch
Any soft spot on the roof means water has already penetrated the decking. If it's soft in one place, check directly below it inside — you'll almost certainly find staining or rot.
Water damage is the most expensive thing you can inherit. Every soft spot or stain has a history.
The Smell Test
Before you look at anything, close the door, stand quietly, and take a breath. Mustiness, mold, or a sharp ammonia smell (rodents) are flags worth paying attention to. You can fix a lot of things — you cannot fully un-mold a trailer.
Winter Bypass Confirmation
Ask the seller if the trailer was properly winterized each year. A single season of burst pipes can mean hidden plumbing damage throughout the rig. Signs: water stains with no obvious source, low pressure at specific fixtures.
⚠ Dealbreaker Watch
Any signs of DIY electrical work — exposed splices, wire nuts, mixed wire gauges — should make you nervous. RV electrical fires are real and usually start at a bad connection.
Why Test Both Modes on the Fridge
RV absorption refrigerators can fail in one mode while working fine in the other. A fridge that runs on electric but won't light on propane — or vice versa — is a repair job. Replacement absorption fridges are expensive.
The Offer Rule
Every item that's wrong is a negotiating point, not a dealbreaker by itself. Get two things: a written list of everything you found, and a rough repair estimate. Then decide if the asking price — minus those repairs — is still a fair deal.
Schedule the inspection on a sunny day. Natural light makes delamination, water staining, and roof cracks dramatically easier to spot than overcast or artificial light.
Bring a spray bottle of soapy water even if you don't think you'll need it. A propane leak that isn't caught at the seller's driveway becomes your problem the first night you're in a campsite.
If the seller won't let you run appliances, test water, or plug into power, walk away. A motivated seller with nothing to hide has no reason to restrict a standard inspection.
The three most expensive things to get wrong are water damage, frame damage, and bad tires. Water damage starts at the roof seams and shows up as soft floors, stained ceilings, and bubbled sidewalls. Frame damage usually shows at welds near the hitch and axle mounts. Tires should be checked for age via the DOT date code — not just tread depth — because trailer tires over 6 years old are a replacement cost to factor into your offer regardless of how they look. Everything else is negotiable; these three are not.
Yes, almost always. A certified RV inspector charges $200–$400 and can find issues that aren't visible without removing panels, using moisture meters, or testing systems under load. For a $15,000–$50,000 purchase, that cost is trivial. Even if you run this checklist yourself and feel confident, a professional inspection before a private-party purchase is still worth the expense. Where it matters less: dealers offering certified pre-owned programs with documented inspection history, and very low-priced trailers where the cost of inspection approaches the cost of the rig.
The three-part water damage check: (1) look up at the ceiling for any yellowing, staining, or soft spots — these trace directly back to a roof leak above; (2) press the screwdriver handle (not the point) into the floor near doors, windows, and the bathroom where water most often pools and soaks in; (3) check sidewalls by pressing gently — solid fiberglass doesn't flex or feel spongy. Also use your nose: mustiness in a closed trailer almost always means moisture that hasn't fully dried.
The general guideline is 5–6 years from the manufacture date, regardless of tread depth or visual condition. Trailer tires degrade from UV exposure and ozone even when not in use. Find the DOT code on the tire sidewall — the last four digits are the week and year of manufacture (e.g., 2319 = 23rd week of 2019). Tires approaching or past that threshold should be priced and factored into your purchase offer.
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