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Hi Keith. I’ve used upside down unistrut on my mini obs for the roof rails and it works fine. I didn’t used the wheels you mention. I opted for brass rollers running on top of one of the sides if the unistrut. Then added a T section at each end of the roof that runs inside the unistrut as hold down, preventing the roof lifting at all.
Good luck with your build.
Cheers
Rex VK3OF
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