You can find us online at 2019 GMC Yukon The premier GMC dealership in the Tustin CA area is without a doubt Hardin Buick GMC! Take one step on the lot of Hardin Buick GMC, near Tustin CA, and you will quickly see why we are the premier. Hardin Buick GMC has the premier GMC inventory, from pre-owned to new. Hardin Buick GMC has the premier GMC service department. Hardin Buick GMC has the premier GMC parts department.