Here was my little project I made from a kit. Mounted a two prong garage hook on the front of my trailer to put it on. (second pic) Light and easy, I didn't want to bother with something I needed to register/insure and all that. Essentially it's just a scooter with some pedal assist for steep hills.
I just use a bike lock to lock it up, really depends on the run if I do the shuttle first or after, if I pass the take-out or the put in first on the way there.