I found a supplier of wide aluminum in the Seattle area, finally! Western Trailer Repair (707 South Lucile Street, Seattle, WA 98108, 206-762-7850) carries truck trailer roof coil 103" wide, cut to any length that you need. It is .040 thick, and runs $11.40 per linear foot. The best part is that they will sell to the general public, and they don't care how many feet you purchase! I have been thinking of building my tear around 6' wide, so finding a supplier of wide aluminum was a huge deal for me.
Any of you that have worked with truck trailer roof coil, I would love to know how it turned out for you and how good the quality is.
Amy