Oh yeah, mobile barrage balloon setups were reasonably common. The British used lorries for mobile deployment of balloons, and of course, they were popular on landing craft during amphibious invasions. The following site has lots of great information and nifty photos of barrage balloons in action:
http://www.skylighters.org/barrageballoons/
this is what i like about this place.......ya toss an idea out there, and it snowballs in a good way.
now if we could find a way to add em without making too much extra work for htc.