lockable straps? what do you do with your longboard?

I'm planning on buying a longboard but I'm worried about when I'm camping and have to leave it on a car (as it'll be too big to put inside).
Do you think these lockable straps would be any good?
http://www.stickprotection.com/pro_surf.htm
I'm not sure... surely someone could just cut through them? I've seen things to put in your fin slot but I don't know how easy or how much hassle that'll be.
What does everyone else do?
Do you think these lockable straps would be any good?
http://www.stickprotection.com/pro_surf.htm
I'm not sure... surely someone could just cut through them? I've seen things to put in your fin slot but I don't know how easy or how much hassle that'll be.
What does everyone else do?