I mounted my solar panels into the plywood without regard to hitting structure. No problems for 7 years. When I installed our Winegard Travler dish. I wanted a few screws into aluminum structure. Electronic stud finder found structure to screw into.
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2002 Montana 3250RL upgraded a bunch
2005 Ford F-250 6.0 Bullet Proofed - SOLD
2017 Ford F350 6.7 Lariet
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