Built a new box for my 38 Dodge truck using this design.The (cap) saves trying to weld a piece of pipe solid,just stitch welded in and out to prevent warping.Sure saved a lot of body work and was built to have(hinged) tonneau cover fit inside the inner edge.The whole box cost me around $400. including tubing for uprights and angle for frame.
The exact measurements arent there cause years vary in size.The pics and plans are in my gallery.........
The exact measurements arent there cause years vary in size.The pics and plans are in my gallery.........