Hard or soft tonneaus, roll-ups, tilts, tool boxes, Auto Trim Design carries them all. From Extang, Roll & Lock and more. All of our truck bed covers are fully custom designed for a flawless fit on your pickup. Got a long bed, or a step side? We have just the tonneau cover for your pickup truck. Your tonneau cover creates a more aerodynamic profile, which cuts wind drag at your tailgate and improves your fuel economy. Tools, gear, luggage or anything else you put under a tonneau cover is less likely to disappear.