Personally, I feel like if you have good mirrors, you have what you need. There is nothing you can do about anything directly behind you. I've pulled 53' semi-trailers. You just get used to using the side mirrors and they pretty much tell you everything you need to know.
These are $360 on sale. If you think they'd make your tow easier or be of interest, that's not a crazy amount of money. I do believe it's an additional wire to plug in and mind at every hookup.
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