After you install all of your goodies, measure your height. Then, write it down and paste it to the visor of your Tow Vehicle. Then, don't go under anything that is less than 3" higher than your measured height. Why do I say 3"? Well, when the DOT gets done repaving, they often DO NOT remeasure the height of the underpass, and paving can add 1 to 2 inches!
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