Southgate Pontiac Buick GMC hummer carries the full line of Pontiac, Buick, GMC and Hummers. Including the all new GMC Acadia. Comfortable, incredibly functional and stylish - GMC has challenged convention and merged the best of what you need with what you want and of course the Legendary Hummer H2 and H3 exclusive in Northern Alberta to Southgate Pontiac - Like Nothing Else.