Helped a buddy replace the fabric in the awnings on his Class A this summer. Ordered replacement fabric from Tough Top Awnings -- http://toughtopawnings.com/
The fabric was a much higher quality than what was originally installed. They also have some great videos on the site showing how to measure, order, and replace the fabric.
Not associated with them in any manner, just passing along the good quality of the fabric we git from them. That's my 2 cents worth
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2006 Chevrolet Silverado 2500HD 4x4
1998 Lance SquireLite 165