Quantum Fuel Systems Technologies Worldwide recently showcased its new high capacity Q-Cab 160/180 Back-of-Cab CNG Systems and its Q-Cab 123 alongside the Q-Rail 46 CNG Fuel Systems at the 2015 North American Natural Gas Vehicle Conference & Expo (NGV) in Denver, CO.According to the company, the new systems integrate Quantum's recently developed 30-inch diameter storage tanks.“Quantum's leading-edge engineering design delivers the highest capacity, lightest weight per DGE back of cab CNG fuel modules in the industry,” the company said. “Quantum's 180 DGE configuration represents the highest storage capacity for a back-of-cab system currently available in the industry.”