WRT awning thefts - my guess is that you're on your own. It's the equivalent of leaving the front door wide open as it cannot possibly be secured.
Somehow the thought of some gloating tea-leaf with a swag-sack full of plastic storage boxes and saucepans tip-toeing around a site springs to mind.........more caffeine vicar????
I think that with larger sites that are gated and only allow access to club members - whatever flavour - then you're probably limited to folks just wandering in and looking for small stuff they can pocket and walk out.