C15A - WO16 - Chev Blitz - Looking for guidance

[peterinair67]

Sorry if I am asking obvious questions... The truck has U Bolts holding the upper rail to the Chassis and the Timber bed sitting on and attached to that upper rail. All different points, all different angles and methods, sometimes through holes in the rail, some are over the top and wrapped all around. Can anyone post a picture on how I should attach the upper rail properly? Also, there is a piece of timber between the chassis and the upper rail, is that correct? Looked and looked but can't find pictures of these areas anyplace. Thanks.