I tore the plastic wind deflector off from the underside of my Tahoe. It is the black strip that is 3-4 inches wide and 6 feet or so wide. Was off-roading, got hung up and ripped it off. I still have it and I could potentially reinstall it but may get torn off again. What is the purpose and is it important to have? Must be of some importance bc most vehicles seem to have them including large trucks.