How about instead of one large air bladder, the inflatable pad contains a number of smaller bladders. Thus removing the possibility of bouncing or rolling off the thing, or the possibility of displacing all the air? I know it would be a bit on an embugerance to build, but you may need less solid strapping than holding a single bladder in place. And you could replace a single bladder of many more easily and cheaply than one large bladder.
Or look at some sort of baffle system inside.
Good luck, and hope to see your idea work out!
Jason.
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