We have a 2014 Ford Flex. The manual does not say we have to disconnect the battery, but after experiencing a dead battery twice, DH installed a knife-blade switch on one battery post and the last thing he does when setting up to tow is throw that switch.
As soon as we open the car up, we pull the hood latch and he reconnects. I read somewhere that if you restart within so many minutes it will remember all the settings. It does. We've never had anything we have had to reset.
Also, if you don't start it quickly, the alarm goes off. LOL
It works great!
Dale