Vehicle security for long road trip
i think it kind of boils down to preventing crimes of opportunity (casual thief or joyriders) and keeping the whereabouts of the vehicle known (professional thief).
on the pro side of things, if they want it they are going to take it. a skilled operator with a stinger truck or a rollback could grab up a car in the blink of an eye-- short of chaining the damn thing to a post as mentioned previously.
a club type device, alarm and a gps tracker like K-dog has would probably cover you about a well as one could hope. add a kill switch or yank the coil wire and that just fortifies the position. parking with some thoughtful intention is just another plus on your side of the ledger.
air tags and smart tags are identifiable, and while that will let them know that you know it does little to actively prevent theft.
up your comprehensive insurance and get an agreed upon value. then go and enjoy the trip of a lifetime without worry on your mind!