Thank you for visiting A-Mar Auto Group. "Your Texas 4x4 & Diesel Trucks SUPERSTORE" A-Mar Auto Group is an American Company owned and operated by Texans. We are a leading used 4x4 Diesel Truck Dealer located in Mansfield Texas. Our goal is to supply the consumer with quality used Diesel Rigs at affordable prices. So whether it is a Work Truck that you need, a Truck to haul your toys, boats or just a daily driver, look no further, your Diesel Truck is here.