Infiniti QX56 Preview – 2007 Detroit Auto Show: Infiniti’s giant QX56 is a seven-passenger luxury SUV based on the Nissan Armada, which itself is based on the Nissan Titan full-size pickup truck. Because the QX56 is based on the Nissan Armada and Titan, luxury SUV buyers have easily seen through what has been a rather thin veneer of leather and wood trim concealing a pedestrian foundation. Add the effect of growing pains at the assembly plant in Mississippi and skyrocketing gas prices, and the Infiniti QX56 stumbled right out of the gate. Key updates for the 2008 Infiniti QX56 aim to correct this problem.