Security cameras

Well, the wife's VW had her front left tire slashed last night while it was parked in our carport. This is the second time. Last tire was back left. These are on the side furthest from our house. Getting tired of our neighbors who we know are doing it but we need to be able to prove it. Anyway now we're thinking of getting some security cameras. We do not have access to electricity in our carport so we were thinking of somekind of wireless system. I know there are cameras hunters use that are motion activated but not sure if this would be the best. Any suggestions or first hand knowledge would be appreciated.