I just bought a new truck back in December, and I feel you. Your best bet might be to find something a little on the older side with low miles that has no connectivity features whatsoever. Carmax was a great resource for this, but I still had to do a significant amount of research before doing anything. Avoid GM/GMC like the plague, OnStar is officially spyware at this point, and Ford with their Sync crap isn't any better. Basically, avoid anything that offers LTE or WiFi capability, but also beware that even pairing Bluetooth to your car can be a breachpoint.