Whilst being easier to put up, air awnings are by there very nature heavier than a traditional canvas awning, and having back problems myself I can fully sympathise. We tried a couple of air awnings, and of course we have had numerous full awnings, and we now do something a little different.
Firstly though, for anybody struggling, I can thoroughly recommend the Kampa Awning Puller. I bought this with my first Kampa Air and I thought at the time its probably going to be a piece of junk. I was however wrong and its one of the few caravanning accessories I have bought that is superb in every way. I am not overly tall and I find this solves all the problems.
Secondly we went down to the Isabella Porch (Magnum) and find most of the time its more than big enough. To that we added a tall annex and we actually use it as the door for the porch on longer stays where it also doubles as a useful storegae room and gives us the size almost of a full awning. Best of both worlds.
As for a canopy, I have always wondered, and I had a 4m Fiamma many moons ago, whether it was putting strain on the awning rails whilst travelling. We never did buy the sides for it, and whilst easy to put up (down actually) I never was happy with it.
But yes, Porch awning, fibre poles and the awning puller, life is easier.