I opened this thread thinking it would be a good discussion on how to stay legal, making sure that a truck gun was legal length, not cut down too short for a < 21 year old, what sort of hunting would the OP do, etc. Wow. I didn't think it would be about how NOT to stay legal!
1) Don't hang out in the wrong spots, 2) don't hang out with the wrong people, and 3) if you get to your vehicle then just drive away.