I think the issue I'd have with relying on the in-built technology, is that it will not be too difficult for a crim to discover the location of the router, sim and aerial in order for him to simply target that device or jamming that device immediately they break in or steal the van....so disabling the system.
Agreed if GPS (SIM) type of tracker device. But if VHS then difficult to jam.That same jammer can be used against additional installed tracking device. They just won’t be able to find the aerial/device that easily.
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