Just last week I replaced my 11 year old Dometic awning and Carefree slide out topper material from RVawningsmart. For a 21' main and 88" Slide out the total bill shipped was $265. These are 15oz vinyl and the 18oz from Tough awnings would have been $300 just for the main awning. No doubt the 18oz non laminated would have been superior, but if these last 10 years then IMO that's a good service life at a decent price point for awning material. The material I got was by SunWave so only time will tell how well they hold up.
I used the "alternative" replacement method where you don't have to remove the roller tube or mess with the spring. I also used two pulleys one each side of the replacement material tied to the far end awning secondary support with ropes attached to my deflappers attached to the new awning so I could slide the new material in while still feeding the new material into the tracks so it would not hang up as it was pulled into the channels. The only help I has was from my wife who manned one of the pulleys during installation. Very easy method of replacing the fabric and the quote for just the main awning from my local RV dealer was in excess of $650 which IMO was outrageous.
I was able to replace my slide out material w/o any help by using one of my gutter sections that I use for my sewer hose support to hold the new slide out material with one end on the slide out and the other on a ladder so the material slide directly into the slide out channels.
Larry