We have just purchased our first caravan and obviously want to make it as secure as possible. It is already fitted with an IDM alarm with a Tilt Sensor, it also has an AKS 1300 stabiliser so we are getting a Coupling Lock, and a Bulldog Euro Clamp for the wheel. Now reading through an old Practical Caravan - Guide to Caravan Security leaflet, I read with interest about the Airmuscle K-Nut Towball Bolts. These are special nuts that you attach to your towball preventing would be thieves from unbolting your towball from you car and bolting to their vehicle and driving away. However I have been unable to find them on the internet. I would be very interested in other people views on these bolts, also if there are any other alternatives and where these can be obtained from.