The Ark Heavy Duty Trailer Lock is your best friend if you're into boating or caravanning. The lock features a heavy-duty, dual-locking position and is a strong and smart way to secure your trailer, be it free-standing or attached to your car or 4x4. Built tough, and with a chrome finish, it's the best and safest way to secure your boat, trailer, caravan or camper trailer in the driveway or at the campsite. The Ark Heavy Duty Trailer Lock is a smart investment, no matter how you look at it. Not to be used while towing.