Prevention is always better the cure and yes it might be expensive to at least make things look as if it might be difficult to lift, towbar locks, rim locks, wheel clamps, reducinh the opportunity etc but in some parts of the country these items are almost essential and it's better than nothing.
All that gear might never even get put to the test but that's the chance one must take.
If they want something that bad then they might have to make a bit of noise to get it and might look for something a bit easier.
Also from an insurance viewpoint the owner has a requirement to at least ensure things are as secure as possible otherwise the insurer might only pay a % as they might deem the owner to be partly responsible?
Regards, Kerry.