I just drill a 3/16 hole in the cross members and crank a number 12 sheet metal screw or a lag bolt into it. It will hold a lot of weight. Just don't go through the cross member and out the roof panel. Like Dwight Privilege said, run a unistrut or 2x4 or something across several cross members and it will hold just about anything.
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Hopeless Busaholic!
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