Shopping for a GMC truck or SUV? Turn to Mastria GMC. Our GMC dealership in Raynham, MA, is known for providing a wide selection of a new and used GMC vehicles available for competitive prices alongside a certified auto service center. As part of the Mastria Auto Group, we offer enticing advantages over other New England car dealers like a Customer Care Manager, our Mastria /30 Worry-Free Guarantee on used vehicles and the Mastria Certified Program.