I haven't done my install on my truck camper yet... but here's my plan.
I bought Renogy 100W solar panels and the Renogy Drill Free mount kit.
I also bought the metal brackets "MTS-ZB" that screw on. These brackets will be between the open areas of the bonded on "drill free kit".
In the Z bracket installation instructions they recommend using McMaster Rubber well nuts when you drill through the roof. This adds surface area and won't tear out like a screw through fiberglass or plywood. I will drill holes for the well nuts, Coat with adhesive sealant, Install them, cover them with EternaBond tape. Then put a 1/4" metal shim above them (The Z brackets are shorter than the drill free mount height). The Z brackets will mount on top of the shims, with screws threaded into the rubber well nuts. Lastly, I'll dicor around the shim and fasteners.
On all bonded (adhesive) areas, I'll clean the roof surface with Acetone (check for your materials compatibility), then take duct tape, or gorilla tape and press it down, then peel it off. If it comes off easily, do it again with new tape until you get a good bond. This eliminates any loose particles, oils, etc, and creates an active surface for bonding. Then apply the adhesive and bond and screw the panels down. Make sure to clean and "tack" the panel mounting surfaces also for good adhesion.
It's best to have air flowing underneath the panels if they are thick. Aerodynamic lift happens when air goes over the panels, but not under. By passing air underneath, you will minimize lift.
Lastly, I'll drill each panel and add a safety cable to other panels/mount. Your electrical wires will not hold a solar panel once it's lifted and airborne. At least the cable will avoid it from flying off on the highway.
Overkill? Yes. You will see YouTube videos of many people just using tape/adhesive. If there is an issue later, they seldom come back and fill in the final chapter. There was one video that I saw of a bus that lost his panel onto the highway. I actually lost a folding table that was tied to my roof rack. When I stopped to see friends, they asked what was that metal bar hanging out above my truck camper roof. It was the remaining section of the rack. The table and 2/3'rds of my roof rack were missing. I'm guessing the aerodynamic force lifted the table until it caught air under the leading edge. It left silently, ripping the roof rack up and tearing the metal off. I had a truck on a deck over trailer being towed behind the truck camper. The table and roof rack never hit that.
There's a thousand ways to fail and only a few to succeed.
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