Professional heavy duty wheel clamp made by A H Hansons UK cost £270 plus shipping, This is not a cheap thai one made from rebar, it the same as used by most UK police forces and parking enforcement companies.
It's good for securing your car or trailer if you are not in Thailand full time it gives you peace of mind.
Or use when someone parks on your property illegally.
If you a Boat trailer, Caravan or a Trailer help to prevent someone stealing your property.