I also own an '87 Toyota pickup, which thieves stole a few years back. I thought owning a vehicle that old and worn-looking (it runs as well as new, just doesn’t look it) would keep it from being stolen. They left behind another, newer, Toyota pickup (cops wouldn’t let me keep it, in trade.) A week later the cops found it. I couldn’t get out to pick it up quickly enough for them on my bike, so it was towed. I had to pay $300 to get it back from the tower. It had the registration forms from 3 other cars and 6 bags of trash.
I took a necessary part out, keep it in a jar inside. I don’t leave anything valuable in the cab.