I always thought Power Pole covers were silly. About 3 trips ago I was coming back going through the Indian Reservation, and I just happened to look back to see one of my blades coming up, and go back down - dragging down hiway 190. I pulled over immediately and one of the lines had sprung a leak. I figured the spike would be history, but it was only ground down about 1/2 inch - no big deal. Some type of strap or cover probably would have stopped it from going down. All I had to do was replace the hose and top-off the fluid. By the way - Power Poles will not stop a Duramax Diesel!