3M VHB Bonding Tape
Just to give an endorsement of this heavy duty double sided acrylic foam tape for attaching solar panel support frames to your TM roof. I used this tape to fasten 2 x 80W panel support frames on the rear roof of my TM and the adhesive strength was very impressive, absolutely no drilling was required to secure the frame. But be precise when using because you can not slide it, initial touch down is final final. Many hardware stores don't seem to have heard of VHB but it can be purchased online from 3M.
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