How do you store/secure your portable generator?

Before I got a locking tonneau cover for the truck, I would use heavy cables and a heavy-duty bike lock (with the security handles) to secure them to the trailer frame (when we were at camp) or in the bed of the truck (when we were away). We would also cover them in the truck bed with other things and a tarp over everything.

Now that I have a solid locking tonneau cover, it's much simpler. Out of sight is 99% of the battle, in my opinion.