The problem with GPS trackers is they are easily blocked with a £10 gadget that plugs into the cigarette lighter. If you want a good tracker you need to be looking at Cat5+ trackers which are VHF/GSM/GPS.
I keep hearing about VHS supported trackers a lot lately, apparently they are excellent against thieves that use jammers. I will definitely check them out and yea Faraday pouches are a must now.
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VHF I assume you mean...
And anything in this area is cat and mouse. If enough people switch to VHF, then a blocker will become in common use for that too.
(I did just write a long piece on how you'd do it, but decided that documenting it wouldn't be a smart idea, but take it from me, its possible)