I like the box idea too, but....it would have to be smaller though. Oh, and by the way, got my PDP second fuel filter diff breather kit installed. I tried to find a way to put the fuel cut off somewhere on the bottom of the chassis but decided to install it inline with the fuel filters. I had to add a relay but it works. Works so well that I have forgotten a couple of times to switch it off. I was able to get about 100 yards before the truck died.