So after writing to GD asking questions about the roof on my 2019 Reflection 303 RLS , i did get a drawing sent to me showing where the roof truss spacing and where the AC venting goes. i never did get my other questions answered and I know some of you have done roof projects.

i want to add solar panels. Can anyone tell me the thickness of the roof material on these roof systems? I assume plywood under the roof membrane. Recommended screws or fasteners? Of course thinking stainless steel, but i have heard of thin roof material needing expansion bolts as fasteners.

Any tips of help appreciated. I am also putting a 1 1/2" hole to mount a cellular antenna shaft and cable drop to cell router, plus some type of solar PV wire drop from the roof into the coach so type of fasteners is needed. If it is at least 1/2" plywood or similar, I would guess normal SS screws would work.