They sit pulled out on the down tailgate, and the bed cover lid is closed so bed contents are weather protected while the gen sets have room to breathe. In use or not, they are always tethered to a built in padeye in the bed with a 3/8 inch cable and padlock. That keeps them from wandering away. If'n its raining, I can set them on the asphalt under the down tailgate and that will work fairly well as they are suppose to be weatherproof. From the outside, day or nite, you can't tell if'n someone is looking out of the front windows. A scavenger would have to have a set of brass ones to risk it, not knowing the personality of the owner.