So far so good! Deck made it easy to shovel after a recent snow storm.
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We've dinged the deck panels a couple times. Easy repair just remove the panel, sand and repaint.
On the larger panels, we added finger holes for easier handling. Sometimes we use a pull strap to raise the panels onto the roof. Be careful the non-skid is like sandpaper and it scratches. Might be smart to put the non-skid only on the top surface.
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The narrow slots on the crossbars require somewhat precise alignment. I made the bolt-down holes oversized, used drop-in t-nuts with fender washers. There's enough slop in the system such that the bolt-down holes don't require perfect alignment with the crossbar slots.
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The t-nuts are Amazon.
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Yes I use the crossbars that came with the FlatLine rack. Purchased two extra rails from FlatLine. Also bought a couple of short bars and L-bracket connectors from 8020 to reinforce the decking on the sides of the roof fan.
In front of the fan, there is roughly a 15-inch span between the crossbars. The panels flex under bodyweight, but give adequate support. I do not notice vibration or sound at highway speeds. The gaps between the panels have been useful as handholds.