If your talking about the piece that the block of wood is screwed to, then what I had to do was put 4 lag bolts through the back of the box, through the 2x8, and through the first part of the back of the cab, without going all the way through. Of course, I walled off this truck, so you can't see the piece anyway, but at least that piece don't rattle. Haha. And we put 3 layers of RAAmat on the roof, and it still flexes quite a bit, and that's with only 850 watts going to each sub. I can't wait to see how much it flexes when I put the Memphis 4k in. //content.invisioncic.com/y282845/emoticons/up2something.gif.dd110ecf3ae4b76050d87598f2f8de7c.gif
And you don't even know how much of a P.I.T.A. that bump is when your making a box that will barely squeeze into the truck. And btw, the extended cab does not open up so that box went through the passenger door.//content.invisioncic.com/y282845/emoticons/crazy.gif.c13912c32de98515d3142759a824dae7.gif