| United States Patent | 7,232,156 |
| Rife , et al. | June 19, 2007 |
A frame for a gaseous fueled vehicle is provided. The frame includes a floor pan, a tunnel positioned centrally and longitudinally in the floor pan extending a full length of the frame, and a tank integrated into the tunnel, where the tank is circular in cross-section and has a variable diameter. The tunnel may also integrate two or more tanks.
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