We stock an extensive range of approved hitchlocks as well as simpler universal models. An anti-theft lock prevents a thief from coupling the trailer to a car, which makes theft more difficult and usually stops it. Many insurers require an approved hitchlock on a trailer left unattended, so it is worth checking the terms of your own policy.
Hitchlocks
Related parts: overrun brake parts, coupling heads, overrun brakes, breakaway cables, brake transference and couplings.
The largest makes in this category are CombiLock with 6 of the 30 parts here. For securing a cycle on a carrier see cycle locks.