Prior to deciding on this upgrade, I contacted Winnebago, manufacturer of this year model Sunnybrook trailer. They gladly sent a diagram of the side-wall aluminum frame construction with placement of the wood backers. This way, I'd know where to install the mounting hardware. It's mounted very solidly.
Mike
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2006 Chevy Silverado 2500HD CC/LBZ Duramax
2017 Hyper Lite XLR 26HFS
Previous Trailers:
2003 Aerolite 24RK
2006 Rockwood 3115SS TT
2006 Rockwood 8283SS FW
2005 Jayco Talon ZX24E
2012 Sunnybrook 26FBS