Asphalt shingles. We won't be quite that high,,,about 12' at the highest. Probably won't need all the sections, actually. Have to pick it up from whoever BIL loaned it to; not sure how much it will be. Shouldn't need all 3, come to think about it. I'm not overly enthused about being on top of 2 sections!
Yeah it gets wobbly, wire it to the building will help.