I've done one replace the vinyl with a fella, it was a pain to do, about the same age and the barrel packed it in 6 mths later so then he went with a new awning with barre and it took us half the time ... If the awning vinyl is dying from old age then the barrel insides are probably the same ............ Have replaced a few awnings for myself and mates, certainly one with a barrel is far quicker and once fitted doesn't need any revisit ...... If you look at
https://www.caravansplus.com.au/ they will show you a price range for your model, also has a measuring diagram so you get the size right then you can shop around, I bought my last awning from
https://www.outbackequipment.com.au/ in Brissie, genuine job and quick to deliver, another storm damage and was cheaper than the insurance excess and less hassle, took 1.5 hrs as Big Mal is Big..............