I did 3 BougeRV 170 Monocsrystalline panels. The Z brackets elevate them for effective cooling. Drilled and screwed directly into the roof - use Dicor self leveling sealant generously in the screw holes plus over and around the brackets where they attach. They've remained secure and do a great job topping off the house batteries even with moderate electrical use.
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Capt Tom
Aviator, trailblazer, last of the big spenders, father of dragons, RV newbie
"What happens in my Vegas, stays in my Vegas."
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