Trim: Base This Onyx Black 2018 GMC Sierra 1500 Base might be just the double cab 4x4 for you. It has a 5.3 liter 8 Cylinder engine. This one's on the market for $42 170. With a crash test rating of 5 out of 5 stars everyone can feel secure. Flaunting a classic black exterior and a dark ash/jet black interior this car is a sight to see from the inside out. View this beauty and our entire inventory today! Call for more details. Customer and VIN# must qualify for GM rebates and discounts. Take delivery by the end of this month to take advantage of the GM rebates and discounts. Some rebates require a trade-in vehicle. If a deal has not trade you will have to give up the trade assistance rebate. Contact Information: Harry Robinson Buick GMC 6000 S. 36th Street Fort Smith AR 72908 Phone: (479) 646-8600 E-mail: email@example.com.