In the video, I was playing on mobile on Saturday, 4 December at around 1:30 GST. In the video, the semi truck and the trailer were both seperated. The semi truck had a rocket booster installed. However when I press the activate button, there was fire blowing out of the rocket booster, but the semi truck itself did not even move. Instead of the semi truck moving when the rocket booster was activated, the trailer was the one that move. I apologise if the video cannot be watched. I hope you can look into this matter.