My experience in the middle of Idaho is that the system works as well as expected. You still have to drive the vehicle, slow down, etc. It isn't going to react to the rear end breaking loose.
One of my latches quit working. I contacted Smartcap, and they said they had a bad batch. They are sending six of the old-style latches and will replace them with upgraded new-style latches when they become available.
I did my lightbar that way on my third-gen Taco and had planned for this with my ditch lights with this truck, but alas, I couldn't find the high-beam wire to tap into.