[StingRay]

Just an FYI. The cab and chassis rear axle width is different than a standard pick up box axle width. A cab and chassis rear end is the same width as a normal single wheel rear end and a stock box will have just a little of the outer wheel hanging out. You will need a pick up rear end to use wide fenders and then get your 4 feet between the wheel wells. I've always liked the look of the standard narrow box with the wheel tubs widened towards the frame. Can't get a sheet of plywood int there though.