Hmm... so everytime you get out of your truck you have to pull on the cover? seems like a painin the ***, but I guess it would work if you were worried about hail.

Utilizing teh same idea as befor, you could make a rear window rack in the bed that had the "airbag" in it, and wire it up to a powersource that is not inside the cabin. you could hook up the activation trigger to most newer alarm systems and remote starts that have the aux button. (for door poppers and stuff) DEI makes a remotestart/alarm with an aux button that reaches up to a mile.... You could just hit the aux button to inflate the cover, no need to cover it befor you leave it... Too bad I dont see this ever working correctly without a masters in engineering... :-D