I have an OzTrail awning on my car. I wanted an extension made.
My local camper trailer mob, sat down with me and nutted out what I wanted and what they could make for me.
I ended up with 2.5 x 2.5 extension, one side has rope to go into the sail track on the awning, eyelets at 2m out, and on the end.
The theory behind this is, I can use the extension as a wall on my awning, or a longer roof, with a 500mm extra awning to block sun, wind etc..
This all came (as a first run as they had never been asked this before) with poles etc, and a custom bag to put it in, for just under $300.00.
Expensive compared to the awning itself, but first use was at TuffTruck 2012 with my youngest, two swags, table and chairs, all under cover for the weekend.
Awesome.
So, Danny, to answer to one of your questions $500.00 IS rich. The above was made from quality canvas, and while not the same as the awning, colours was close enough for me.