Many new cars have backup monitors with in-screen distance sensors that will turn green, yellow and red when you get closer to an object. This would be useful for long trailers so you don't have to get out and check. I'm not sure how hard it would be to get ahold of one of those systems or to set it up but it could be worth looking into.
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He gave me a dollar. A blood-soaked dollar.
I cannot get the spot out but it's okay; It still works in the store
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