Those are definitely RH-5's. The biggest danger is during inflation, when the halves of the wheel male a loud pop as they lock. Even a slight amount of rust damage or improper alignment will make half of the wheel launch itself with deadly force. The man who sold tires to a shop where I worked part time was killed when a wheel half hit him just above the eyebrows while he was inflating a new tire. He didn't use a safety cage, and his luck finally ran out. Once those tires are dismounted, the wheels need to be destroyed by cutting big holes in them with a torch.
Jerry
