Maybe I should have been more detailed. I don't ever plan to leave them behind if we actually leave the site by vehicle. I mainly bought my camper to take my son dirt bike racing. Same as above, I would lock them in the bed of my truck whenever we aren't at the track. But, while he is running a moto, we will be on the track, away from the camper. I don't plan on moving the gen's everytime we walk away so I want some sense of security. I know a determined thief will get it no matter what. I'm guessing a decent sized cable will make for a good deterrent though. And yes, try to keep them out of sight.