I have noticed that all the skidplates I have seen for sale seem to be made of Aluminum. I have one on my bike and it seems to be prone to bending with any sort of impact. Are they always aluminum cause it's easier to construct, or looks better, or lasts longer, or rust resistance,or lighter, or what? I would be happy to have a tougher, steel plate, even if it was a bit heavier and I had to paint it once a year to prevent rust. It just seems like it would be stronger.