Installing Renogy 200W (two panels) on my Kodiak Cub.
1. Do you know what the roof material actually is?
Roof is TPO "rubber". TPO is on very thin ply or chip core. Support trusses are far apart. Step slowly and carefully to avoid breaking the ply. I place an addition 1/4 ply sheet on top to step on.
2. Have you installed solar onto the roof and if so did you drill/screw or use the VHB tape method?
I have not installed solar on the roof.
3. If you drilled, did you find studs/joists/trusses or drill directly into the roof material?
You can find the trusses by stepping on the roof. Thin ply gives, showing approximately where there is support.
If you can hit the trusses, use long screws. If just screwing to ply, use many small screws.
Eternabond tape has been successful for many people. Be sure to follow installation instructions. It requires a clean surface and pressure to fully activate the adhesive.
Dutchman Kodiak Cub KD176RD 2018
Nissan Pathfinder 2015