3/4 square tube. Mounting plates are 2"x1/4 plate. Make the rack and plates, bolt the plates on put your stand pieces on and set the rack. Then tack it up really good. Take it off to finish welding. The roofs are not flat so test fit and tack together.
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New to this forums stuff. Hopefully this helps. Used factory rail inserts and stainless bolts. About $75 in metal and 6 hours of work.
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