Enjoy your time on the road in your big rig with upgraded semi truck electronics from 4 State Trucks. Our large online selection of aftermarket semi truck electronics parts and accessories designed for the best brands in the business, including Peterbilt, Kenworth, Freightliner, and more. Shop the wide variety of custom semi truck parts available at 4 State Trucks to find the perfect options for making your 18 wheeler all your own.