Has anyone witnessed cracked or broken aluminum panel mounting brackets on roof top mobile applications? I read of this in another forum, and just had a friend tell me that he had some friends visiting him in there Sprinter van when they noticed that every bracket on their solar panels was broken at the 90 degree bend. It was a miracle that the panels stayed on the roof. I am concerned as I am about to mount four 210W New Powa panels on our Super-C using VHV tape using these brackets. Perhaps using a bracket on the short ends of the panels as well would help reduce the swaying sort of movement I could imagine occurring if brackets are only used along the long edge of the panels? I don't have room for the plastic type brackets that also include corner brackets.