My new camper (just 6 more days!!!) has a Thatcham 1 alarm and immobiliser, but I'm putting my faith in the new Disklok Diamond that I have on standby. They're a pain, but having spent 8 years on an autocrime team I never once came across a vehicle that was successfully stolen with one on board no matter how hard they tried.
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And for good measure I'm going to conceal an obvious decoy SIM tracker that they'll doubtless congratulate themselves on finding, with another properly concealed and protected.
And our driveway only has one way in and it's covered by an IR beam which pings a doorbell type chime in the house (which in turn sends Bruce banzai) so unless they zip line in from a helicopter they won't even be albe to approach it without me knowing,