I’m not sure I agree. Lots of stuff up there is only fastened to the roof panel and it’s strong enough to walk on and most dealers will just screw panels down to it. Notwithstanding, I wanted mine to be more secure so I used an ordinary stud finder to locate the roof “rafters”. On my coach they are aluminum 16o.c. and were easily found. I was able to fasten all six screws of my 36 inch long panels into 3 different rafters. My panel isn’t going anywhere. Might as well make it as strong as you can.
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