Thanks to complex electronic immobilisers and alarms, crooks are finding car theft harder than ever. But caravans and trailers are still vulnerable to thieves.

Thousands are stolen every year, so securing yours with a hitchlock when left unattended is crucial. The best devices can be used while the vehicle and trailer are connected - essential for caravanners who may stop off at motorway services, a popular spot for thieves. However, for safety reasons, you should never drive with the hitchlock in place, as it will interfere with the trailer's movement in corners.

Make sure you get the right piece of kit, too.