So. I will offer an evidence for oscillation in the early roll.
Note the paired deposits of rubber through the stain and beyond. The two men are standing directly on each individual mark.
Four tyres are making two trails, as they would do. They are soaked in kerosene, which has a marked affinity for synthetic rubber. It wets and remains wet. This helps the marks' visibility. We see that in between pairs of black deposit, there is a portion of skid free concrete.
This is the time when the four tyres are aligned with the a/c motion. the following pair of black skid mark is their misalignment with the aircraft, and the four tyres are skidding in kerosene wetted Elastomer. due to lousy traction, there is no net effect on heading.
The truck then rebounds, returns through the zone of alignment, and deposition of rubber stops, until the truck continues into the misalignment, deposits black, and repeats, disappearing into the soot stained photo.
The oscillation is relatively harmonious, by symmetry of the paired deposits.
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