I contacted Thor and bought a similar rack from them. had to order it through the dealer.
i think it's made by Mor-Ride... the folks that build the chassis extension framework.
My coach had the attachment pivot points (tabs) already welded in place. The threaded rod used to connect the 3rd point was in the wrong location though. Poor manufacturing tolerances I suppose....
Mine doesn't telescope out like that Bal unit does though.
That Bal unit is made for a trailer, but no reason I can think of that a creative handy person couldn't make it work.
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