yea my uncle used to have to repo cars, and i rode around with my grandpa when i was in my early teens when he had to pick up cars that had been totaled (but alot were still driveable, so the owners did not want to give them up), all it takes is 10 minutes and a car, no matter where it is, will be gone with a flat bed. no one looks at you twice because you look like youre supposed to be there doing what youre doing..
on the steadfast issue it seems if they cant cut it off, they would have to break the internal locking mechanism, then know their way around the gm rats nest of wiring under the dash
solution?
make an aluminum or steel plate that prevents access under the dash completely..