Buying a trailer privately – bill of sale, weights and change of ownership
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Buying a trailer is easy to underestimate from a legal and technical perspective. In addition to price and condition, the buyer needs to check registration details, weights, usage bans, inspection status, and verify that the trailer in front of you actually matches the information on the registration certificate.
Key points in brief
- Check the registered owner, registration number, and chassis number.
- Check the gross weight, curb weight, maximum load, and the driver's license requirements for the combination.
- Check for vehicle-related debts and any usage restrictions.
- Inspect the brakes, overrun device, tires, lighting, coupling, and chassis.
- Complete the change of ownership close to the time of payment and handover.
| Identity | Registration number, chassis number, and registered owner. |
| Weights | Curb weight, gross weight, maximum load, and actual usage. |
| Condition | Brakes, overrun device, tires, lighting, jockey wheel, frame, and floor. |
| Documents | Registration certificate, inspection records, receipts, and service history. |
| Handover | Payment, keys/accessories, and time of ownership change. |
Weights determine more than just your payload
The trailer's gross weight and the tow vehicle's specifications affect both the permissible load and the required driver's license category. The purchase contract should therefore reflect the central weight details, and the buyer should personally verify the combination against current vehicle information.
Check for debts, inspections, and usage bans
The Swedish Transport Agency (Transportstyrelsen) recommends that vehicle buyers check for vehicle-related debts and current status before purchasing. For a trailer, you should also check the mandatory inspection status and any usage bans before making full payment.
Inspection report for private purchases
Document the condition systematically. Particularly important points are the frame/chassis, braking system, ball coupling, jockey wheel, tires, lighting, electrical connector, cargo bed/floor, as well as any tipping mechanism, winch, or other equipment. For horse trailers and specialized trailers, additional inspection points may be necessary.
What should be included in the purchase contract?
The parties' details, registration number/chassis number, purchase price, method of payment, known defects, included accessories, date of handover, and how the change of ownership is carried out should be documented. If the trailer is sold "as is," known defects should also be described specifically.
Common mistakes
- Checking the price but not the registration details.
- Confusing gross weight with actual payload capacity.
- Not checking the inspection status before payment.
- Writing 'as is' without documenting known defects.
- Making payment long before the change of ownership and physical handover.
Frequently asked questions
Does the trailer need a written purchase contract?
There is generally no specific legal requirement for a standard template in private purchases, but a written agreement is highly recommended to document what has been bought and under what terms.
What is the difference between gross weight and maximum load?
The gross weight is the trailer's maximum permissible total weight. The maximum load is the difference between the gross weight and the curb weight.
Should the change of ownership be done immediately?
It is wise to perform the change of ownership in immediate connection with payment and handover, according to the Swedish Transport Agency's current procedures.
Can a trailer have vehicle-related debts?
Yes, which is why the buyer should check vehicle-related debts and status before closing the deal.
Purchase contract for trailer 2026/2027
The template package includes a purchase contract, condition/inspection report, and guidance on registration, weights, and change of ownership.
Read also
Sources and further reading
- Swedish Transport Agency – Change of vehicle ownership
- Swedish Transport Agency – I am buying a vehicle
Last updated: October 5, 2026. This article provides general information and does not replace individual legal advice.
