Hello Rod.
I have one of the first kampa air awnings:- the 260 model.
I have made comments before regarding how I have found it. I have also commented that I wouldn't be without it now, and would never willingly get involved with a traditional poles awning again.
But to address one of your points regarding weight. I have found that because the awning material includes the inflatable poles then I find it heavier to initially thread. I still don't have a problem with it but find that I need to make sure the awning is positioned, before threading with the insert beading nicely exposed and in the area below the insertion point. (Hopefully you will understand my meaning)
The reason for this is that until the awning is threaded up the vertical rail and moving along the upper horizontal the actual awning weight does tend to want to pull its self back to the ground. So if there is a restriction at all like twisted material then it could be a struggle to pull this clear whilst maintaining the distance you have already threaded. This is obviously only a bit of an issue if you are alone because anyone helping would be able to easily prevent the awning slipping back whilst you were able to straighten out the material.
Again I'm speaking about the Kampa 260 so unsure if this is noticed with other awnings.
Best wishes Brian
(Oh and don't forget to take your pump)