The answer is sentry turrets.

Don’t worry. We’ve already dispatched one of our best men to handle it.

Now that I know this exists, I suddenly NEED it.

Could just hire Ford to build the wall between US and Mexico using discarded Ford Mustangs and F-150 pickups. I bet they could make that wall 5 cars wide, 30 cars high. It’ll be the best wall, with Ford Sync and backup cameras to catch those illegals.