Basically you have to be aware of exactly who your intruder is.
Is he the determind type that knows what he is after and will observe and plan before making his approach to take only what he wants?
To deter him, you have to get sophisticated with your attempts to stop him.
On the otherhand, if your intruder is the opportunist type then the one thing he will avoid at all costs, is attracting attention to himself and although folks tend to ignore car alarms sounding in a car park, they tend not to ignore them on a campsite. Alarms attract attention and that is what you want in your tent.
Even the odd sounding alarm like the ones that shout "Help, help, I'm being robbed!" will alert those around the site that someone is up to no good.
A pressure mat at the door, a PIR to cover the interior and a good loud alarm and get on and enjoy your hobby with as much peace of mind as you can.
------------- Lobey.
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