Then you get into the whole how do you design a better mousetrap problem. Floors get dirty. Roads get dirty. Car bottoms get dirty. Electrical contacts like to

Then you get into the whole how do you design a better mousetrap problem. Floors get dirty. Roads get dirty. Car bottoms get dirty. Electrical contacts like to be clean. When they are not they get hot, carbonize, and then enter a chain reaction until it fails or catches fire. Whatever solution you can conceive is going to be too expensive simply because you have to protect a high voltage/high amperage connection from the elements.