Most tankers are parked at the Modification center. Drive to 31st PI W (47.8979942, -122.2762810). Two prototypes are parked at (47.9009702, -122.2895550), drive to Bernie Webber Drive. A few are parked elsewhere but you will see. The 2 prototypes have serials. All tankers at the mod center are unmarked, except the ones in the hangar (small stencil with lime nr on front wheel doors).