So that previous video was not showing the start of the explosion, it was showing the end of the explosion. Labeling the end of the explosion "source" is misleading. It's possible when the RV exploded, some of the flammable material was forced across the street, and that's why there is fire across the street.

The first frame with an explosion has the explosion centered closer to the RV than to the other side of the street. I downloaded the video with youtube-dl and stepped through frame by frame with MPC-HC.