Forum Discussion
Rustofer
7 years agoExplorer
I have a sheet of 3/4" ply plus 1/2" rubber between my 2017 NL 9.6 and 2017 F-350, with roughly 1.25" space above the cab. We've taken some very big bumps on the road, with no indication of roof contact. I wouldn't use foam board either - in keeping with Keithmaryq's comment.
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