Hello Corky,
The unit that you are talking about is the same as my fridge, our fridge was made to go into a motorhome rig, and it is designed to lock automaticly (if you have not manually locked the doors) so that when you either start your rig or put it in gear, I too have considered to make mine operate that way but like you once I looked at what it took we decided to just slide the lock in place, but it sure would make you feel good to know that you don't have to second guess (did we lock the door) when going down the road, sorry I did not have the answere you wanted but I did not want others to think your leg was being pulled! But if I decide on going further on it I will let you know or if you do please let me know!
Good luck,
Mike