Caravan Wheel Locks and Clamps: Types, Ratings and Insurance
A wheel clamp or wheel lock is one of the most effective ways to stop a touring caravan being hitched up and towed away. It is also something most caravan insurers expect you to use whenever the caravan is left unattended.
This guide explains the main types of caravan wheel security, what the security ratings mean, and how to check that the device you choose meets the conditions of your insurance policy.
Why Your Insurer Cares About Wheel Clamps
Most touring caravan policies include security conditions. A common requirement is a hitch lock and a wheel clamp of a recognised make whenever the caravan is unhitched and left unattended. Some policies go further, asking for a clamp on each axle of a twin axle caravan, or for extra security such as an alarm or tracker on higher value caravans.
These conditions matter when you make a claim. The Financial Ombudsman Service treats security requirements as significant terms, and it has supported insurers that turned down theft claims where a clamp was not fitted as the policy required, including a twin axle caravan stolen from storage with a clamp on only one axle.
Before you buy, read the security section of your policy, or ask your broker which devices and ratings they accept. If you are arranging touring caravan insurance, have the make and model of your wheel clamp and hitch lock to hand, as you may be asked about them.
Wheel Clamp, Axle Lock or Hitch Lock?
There are three main devices, and most caravans need more than one of them.
| Device | How it works | Good to know |
|---|---|---|
| Wheel clamp | Fits over the wheel and tyre so the wheel cannot turn. | A highly visible deterrent. Many insurers expect it to cover at least one wheel nut, or to be used with a locking wheel bolt, so it cannot simply be unbolted. |
| Axle wheel lock | A receiver is fitted to the axle in place of a wheel bolt, and a locking bar passes through the wheel into it. | Quick to fit once installed and accepted by many insurers instead of a wheel clamp. Al-Ko Secure is fitted from new on many caravans, and aftermarket versions are available. Check compatibility with your chassis and wheels. |
| Hitch lock | Encloses the coupling head so it cannot be attached to a tow ball. | Usually required alongside a wheel clamp or axle lock, not instead of one. |
A wheel clamp is bulkier and takes longer to fit than an axle lock, but it fits a wider range of caravans and moves with you if you change caravan.
Security Ratings Explained
Insurers and storage sites often refer to independent ratings, so it helps to know what they mean.
Sold Secure
Sold Secure is an independent testing house owned by the Master Locksmiths Association. It tests products against timed attacks using the kind of tools a thief might carry, then grades them Bronze, Silver or Gold. Look for the Caravan & Trailer grading specifically, as some clamps carry a higher grade for cars than for caravans. You can check any product on the Sold Secure website.
SCM MP03
A European caravan security standard. Many higher end clamps are certified to both Sold Secure Gold and SCM MP03.
Secured by Design
The official police security initiative. Some wheel clamps and locks carry its approval alongside a Sold Secure rating.
The Camping and Caravanning Club suggests a device rated at least Sold Secure Gold for a caravan in storage. Whatever rating your policy asks for, make sure the device you buy meets it for caravans, not just for cars.
What to Check Before You Buy
- Wheel and tyre size: clamps list the rim sizes and tyre widths they fit. Check your tyre sidewall before ordering.
- Alloy or steel wheels: some clamps are made for one type only.
- Wheel nut coverage: if the clamp leaves the wheel nuts exposed, the wheel can be removed and the clamp with it. Choose one that covers a nut, or fit a locking wheel bolt.
- Twin axle caravans: check whether your policy asks for a clamp on each axle.
- Caravan & Trailer rating: confirm the grade applies to caravans, and that it matches what your insurer or storage site requires.
- Weight and storage: heavier steel clamps resist attack better but count towards your payload and need somewhere to live when you travel.
- Keys: note the key number and keep a spare away from the caravan.
Well known names in caravan wheel security include Milenco, Stronghold, Purpleline and Bulldog, and each publishes the ratings and fitment details for its products.
Using Your Wheel Clamp Properly
A clamp only protects your caravan, and your cover, when it is fitted. Most thefts happen when the caravan is easy to move, so make fitting it a habit.
- Every time it is left unattended: that usually includes campsites and motorway services, not just storage. Some policies also require a clamp when the caravan is left attached to the car.
- In storage: requirements can depend on where the caravan is kept. A storage site graded by CaSSOA may change what your insurer asks for, so tell your insurer where the caravan is stored.
- When someone else has it: if a dealer or storage site is looking after your caravan, make sure they fit the devices your policy requires.
- Layer your security: a clamp works best alongside a hitch lock, and on higher value caravans an alarm or tracker. See our guides to touring caravan security devices and caravan hitch covers.
- Keep your paperwork: hold on to the receipt and certificate for your clamp in case you need to show what was fitted.
Caravan Wheel Lock FAQs
Is a caravan wheel clamp a legal requirement?
No. There is no legal requirement to fit one, but most touring caravan insurance policies make security devices a condition of theft cover.
Will my insurer accept an axle lock instead of a wheel clamp?
Many insurers accept an axle wheel lock such as Al-Ko Secure in place of a wheel clamp. Check your policy wording or ask your broker.
Do I need a clamp on both axles of a twin axle caravan?
Some policies require a clamp on each axle when the caravan is unattended. Read the security section of your policy to see what yours says.
Do I need to fit the clamp on a campsite?
If your policy requires a clamp whenever the caravan is unhitched and unattended, that includes campsites. Campsites and services are common places for caravan theft.
Can better security affect my insurance?
Some insurers take approved security into account when pricing a policy, and some ask for extra security on higher value caravans before they will offer cover. It varies between insurers.