AirTag wont work, anyone with an iPhone can find it.
Same with Tags/Tiles for Android phones.
There are rechargeable GPS magnetic trackers you can stick under the truck on the frame somewhere, requires a GPS subscription (can find the trackers on amazon) and you can setup geofencing, etc.
There are kill switches like:
- IGLA - most expensive, remote start still intact, some cool videos on it for GM trucks on youtube
- Ravelco
- Mobilistics NoStart - cheapest option, no splicing of wires, just a Fuel Pump Relay kill switch
And if you want to go to the extreme so that it will be hard to pull the ECM module out, hehe
https://croclocecm.com/