Shuzie:
I just replaced my slide awnings on my 09 Journey. I got mine from the Tough Top Awnings web site. Mine also were Carefree. Their methodology to replace which requires widening the channel at one end makes the task very simple. You will Need an 8 ft step ladder and at least a 6 ft one for a helper who feeds the awning to you while you pull it thru the channels to do it safely. You ned a drill to widen the channel and a vise grip style oil filter wrench ($15 from Harbor Freight) to do it easily. Took us about 2 1/2 hours to replace both - one of which was 21 feet long. It is a simple task if done using the instructions from the website. The TT replacement is vinyl and thicker than the Carefree original.
Like Herman, I went to the Carefree site to see the instructions for replacing. They have you remove the awning tube which convinced me that I didn't want to wrestle a 21 foot awning 10 feet above ground and try to reinstall It later. While their method undoubtedly works, I would suggest it will scare off more DIY'ers which may be their objective. Check out the Tough Top instructions for the fast and simple approach.
Bob