Not sure if the laws I am talking about apply to big rigs or not, the association I belong to is concerned with passenger car and light truck accessories. I am going to be at the trade show for that this coming week and I'll see what info I can dredge up. I just know it was a big issue for some manufacturers/installers of these items about this time last year. I really did not follow what ground the association had gained with the government regulations involved, that is usually a lengthy process.
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