We made our own. On page 4 post 75, of my build log on the Escappees' Forum might help you see how it was framed.
http://www.rvnetwork.com/index...showtopic=73051&st=0
blizz
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2001 GMC 6500 Topkick, 22' box, dropped frame, designed to fit into a 9' garage door. 3126 CAT 6spd Man Lo-Pro 19.5's w/ 3.07 rear axle ratio
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