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40,000 ft CB SW mov NE. 6:55p.
Moments before, short lived Mammatus was present. 6:55p.
7:15p. Wall Cloud 3 NW mov NE. Radar indicated no rotation.
2314Z, 714p: Base Reflectivity

2314Z, 714p: Storm Relative Velocity
2314Z, 714p: Echo Tops
Panoramic SW-NW of Shelf cloud with wall cloud. 7:15p
Big blocky wall cloud. 7:16p

7:21, 5 minutes later, shelf is falling apart, and wall cloud is getting rained through.
That is indeed a tanker truck. Can you guess what happend next?