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Have you considered roller door channel?
Don't know how big your roof will be, but for my modest 2.4 x 2.3 roll off section with polycarbonate roofing, I used the quasi C channel and rollers that guide garage doors up and down.
The channel is curved on one edge for the nylon rollers to run and flat on the other edge to act as a captive stop for them. I used three rollers each side and it works well, also added some internal backup bungee tie downs against extreme winds. Works well.
Whether the rollers face in or out is simply a construction preference, mine face out to give a slightly wider track and easier to install.
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