Do I need a bill of sale to buy a trailer privately?

Yes, in nearly every case. The bill of sale is your proof of purchase, the record of the price (which sets sales tax), and frequently a required document to title or register the trailer in your name. Some states require it to be notarized. It is especially important for homemade or older trailers that may have thin or missing paperwork.

Does a trailer need a title?

It depends on the state and the trailer's weight. Many states only title trailers above a gross weight threshold (commonly 2,000 to 3,000 pounds) and simply register lighter ones. Utility and small cargo trailers are often registration-only, while larger enclosed, boat, and travel trailers usually need a title. Check your state, because buying a trailer that should have a title without getting one creates registration problems later. See our trailer titling guide for the state-by-state rules.

Where is the VIN on a trailer and what if it has none?

Manufactured trailers carry a 17-character VIN on a plate or sticker, usually on the tongue or the front frame rail, sometimes stamped into the frame. It must match the title and bill of sale. Homemade trailers often have no VIN. Most states will issue one through an inspection process; the seller should provide weight documentation and any prior paperwork, and you complete a homemade or assembled-vehicle titling process at the DMV.

How do I buy a homemade trailer safely?

Homemade and shop-built trailers are common and legal, but they need extra paperwork. Get a detailed bill of sale describing the trailer, its axles, and its weight, plus any receipts for major components. Your state will likely require a VIN inspection and may require a certified scale weight before issuing a title or registration. Confirm the process with your DMV before you buy so you know what the seller must provide.

What should I inspect on a used trailer?

Check the frame and welds for rust-through and cracks, especially at the tongue, crossmembers, and axle mounts. Inspect the tires for date codes and dry rot (trailer tires age out before they wear out), the wheel bearings for play and grease, the coupler and safety chains, and the lights and wiring. On enclosed trailers, check the roof seams and floor for water damage. Surface rust is normal; structural rust at load points is a walk-away.

Does the title weight or the load rating matter for towing?

Both matter. The trailer's gross vehicle weight rating (GVWR) plus its load must stay within your tow vehicle's rated capacity and your state's licensing rules. Heavier trailers can require a different license class or trailer brakes. Confirm the GVWR on the trailer's data plate and check it against your vehicle and your license before you commit.

How should I pay for a private-party trailer?

A cashier's check handed over after the seller signs the title or registration is the standard. For inexpensive utility trailers, cash with a signed bill of sale as your receipt is common. Either way, never pay before you have the signed ownership document, and make sure the price on the bill of sale is the real price.

Buying a Used Trailer from a Private Seller

Trailers look simple, but the paperwork is where private buyers get tripped up. Whether your state titles it or just registers it depends on weight, and homemade trailers need an extra step. Here is how to buy one without a DMV headache.

What does your state require?

Whether your state titles a trailer at all, sets a weight threshold, or requires notarization depends on where you register. Pick your state to see the rules, then get a trailer bill of sale built for it.

Your state

Title or registration depends on weight

Many states only title trailers above a gross weight threshold, commonly somewhere between 2,000 and 3,000 pounds, and simply register lighter ones. A small utility trailer might be registration-only, while a large enclosed or boat trailer needs a full title. Buying a trailer that should have a title without getting the title signed over creates a registration problem you inherit. For the state breakdown, read our trailer titling guide.

The VIN is on a plate or sticker, usually on the tongue or front frame rail, and sometimes stamped into the frame. It must match the title and the bill of sale, and the seller's name must match their photo ID.

Homemade and shop-built trailers

Homemade trailers are common and legal, but they rarely have a factory VIN. Most states will issue one through an inspection, and may require a certified scale weight before titling or registering. Get a detailed bill of sale describing the trailer, axles, and weight, plus receipts for major components if the seller has them. Confirm the homemade-titling process with your DMV before you buy so you know exactly what the seller needs to hand over.

Inspecting the trailer

Frame and welds. Look for rust-through and cracks at the tongue, crossmembers, and axle mounts. Surface rust is fine; structural rust at load points is not.
Tires. Check date codes and sidewalls. Trailer tires usually age out and dry-rot before the tread wears.
Bearings and axles. Jack a wheel and check for play and smooth spin. Repacking bearings is cheap; a failed axle is not.
Coupler, chains, and jack. The coupler should latch firmly and match your hitch ball size.
Lights and wiring. Plug it in and confirm running lights, brakes, and turn signals all work.
Floor and roof (enclosed). Check for soft floor boards and roof-seam leaks.

Match the weight to your truck and license

Confirm the trailer's gross vehicle weight rating on its data plate and check it against your tow vehicle's rated capacity. Heavier trailers can require trailer brakes or a different license class in some states. Sort this out before you buy, not in the seller's driveway.

The paperwork you need

The bill of sale records the trailer, its VIN, the price, and the date. For a homemade trailer it carries extra weight as the main proof of the deal. Use our Notarization Checker to confirm whether your state wants it notarized.

Create a Trailer Bill of Sale ($5) → Trailer Titling by State

Used trailer buyer checklist

Print this before you go. Trailers are mechanically simple, so the real work is the paperwork and a few load-bearing parts that fail expensively.

Sort the paperwork first

Check whether your state titles or only registers a trailer this weight
See the title or registration; confirm the seller's name matches their ID
Match the VIN on the frame to the title and bill of sale
For a homemade trailer, confirm your DMV's VIN-inspection and weight process
Confirm the trailer's GVWR fits your tow vehicle and license class

Inspect the load-bearing parts

Check the frame and welds for cracks and rust-through at load points
Check tire date codes and sidewalls for dry rot
Jack each wheel for bearing play and a smooth spin
Test the coupler latch, safety chains, jack, and hitch ball fit
Plug in and confirm running lights, brakes, and turn signals
On enclosed trailers, check the floor and roof seams for water damage

Close the deal

Record the true price and the date on the bill of sale
Get the title or registration signed over before you pay
Get receipts or weight documentation for a homemade trailer
Pay by cashier's check, or cash with a signed bill of sale as your receipt
Confirm your state's notarization rule and transfer deadline

General guidance, not legal advice. Weight thresholds, titling, and notarization rules are set by your state.

Common mistakes to avoid

Assuming a trailer never needs a title when your state requires one above a weight
Buying a homemade trailer without confirming the VIN-inspection process
Trusting tread depth instead of checking trailer tire age
Skipping the lights test until you are already on the road
Paying before the title or registration is signed over