If you replace the material with a Sunbrella fabric, they will not peel. The sun is pretty vicious and will still eat away at the threads in the seams. Most manufacturers use UV resistant thread, but in the end they also succumb to the suns effects.
If you are going to leave the awnings out in the sun, they are going to need replacing every several years. The Sunbrella fabric with UV threads tend to last longer than other brands of fabric. Lighter colors also tend to last longer than darker colors.
The slide toppers on the MH I bought were almost never exposed to the sun by being opened, yet still needed replacement from the suns exposure to the seams splitting at the roof line.
2005 Safari Cheetah 38PDQ - 2009 Ford Flex
Me (Gatogonow), The Boss (DW), Honey Bunny, Maggie May and Mollie Kay (The Gatos)!