This product more than surpassed my expectations! As an electrician, I drive a bucket truck for work and need a way to charge batteries. And driving an 18,000 lb. truck isn’t always the smoothest ride. But it didn’t move around much (to my surprise) and more importantly it didn’t “fail”. If it had a couple of holes in the back for mounting, it would be perfect, but a little Velcro did the trick.