The blaze started abruptly after it "sounded like a generator over heated," according to a source. Smoke erupted from the top of the trailer, which is when the crew realized it was about to go up into flames, the source adds.
An eyewitness tells ET that the crew on set was able to partially put out the fire, which helped contain it before four firetrucks arrived to the scene and finished the job.
Luckily, no one was injured, according to the source.
This isn't the only heat Cruise has dealt with this week. In a new 20/20 interview that aired on Friday, former Scientologist Leah Remini spoke up about leaving the controversial religion, and she even talked about allegedly being written up by the church after hanging out with its most famous member. Watch the video below to hear more.