Here is a CAD drawing I'm working on, basically the upper tabs will be were the rack will mount to. Two 5/8" bolts going into the rack, the material will be 3/16" and have a second circle piece 3/16" So a total of 3/8" of steel the rack will be bolted against. I could work a double shear into it, but this I feel is substantial enough and is a cleaner approach. Just looking for you guys opinion.
This is the rack I'm using, stock silverado rack. for the record.