check out my Silverado profile
http://streetsourcemag.com/IM/viewusercontent.aspx?IMStyle=2&ID=kleerance
It layed out in the front with 2" lower control arms and just the bag. In order to drag I did have to pull the inner fenders out...Same thing in the rear, it had to be tubbed in order to drag. And just like Welch is saying...if you build a lower profile notch you could probably keep the stock bed floor.