Before you start watching the video you should know that this glitch is very pointless and is not something you should pull of during a public game, so DO NOT COMPLAIN about how this is pointless after you have watched the video.
1. Old, just different car.
2. Not pointless, Works on the car by the church.
3. Less visible if you drive the tank halfway up the hood, Climb the back of the car, Stand in middle of hood in between tank and windshield then crouch. Add me & I'll show. I'm Playstation3...