Hi @kayle ..Solar from ..Alpha Batteries 150w Xplorer ( but sadly out of stock ) to secure I brought some Narrow boat brackets and some alloy bar and used the THULE T Bolts and clamps to use on the roof bars
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A stainless steel bar ( threaded ends ) allows the panels to pivot through the Centre
Regarding Solar panels ….Any will do as long as the frame allows you to drill centre holes for the bar ( 10 or 12mm )
ps it’s not a permanent fitment ..only setup on location