I remember when people driving gasoline haulers hung chains from their axle tubes that would drag along the highway while they drove. You'd see them sparking at night and occasionally the chain would wear to the point it would toss bits of links out behind. Later on those changed to rubber straps and today you almost never see them. The chains were to reduce static electricity and in the 50s some people got the idea this would help with radio static. While a lot of people did this, I don't believe any of them knew anything at all about radio interference, etc. I think most of them just thought it looked neat at a time when looking neat was very important.
