Not sure if this is the right section for this question but it is electrical related.
I'm mounting two 260 watt panels (about 40lbs each) on the flat roof of the RV my wife recently bought. I've seen folks use Unistrut/Superstrut but the added weight worked out to be too much. So I made brackets. I have VHB tape and thought I would use that to help secure the brackets, adding two #14 x 1" screws to tie it all to the OSB under the rubber roof membrane. There will be a total of nine brackets. The roof appears to be a sandwich two sheets of ~1/2" OSB with 2x2 frame inside. Plenty strong enough to walk on.
My question is should I through-bolt some or all of the brackets or will the panels be secure enough with the tape and #14 screws? I don't mind having a couple bolt heads showing on the interior ceiling but would prefer not to do that.
I realize the rubber membrane is only lightly glued to the OSB. The VHB tape will mostly help keep everything aligned during installation.