An unplanned Roof Fall occurred in Main West Intake XC #19.5 (#2 Entry - Primary Escapeway). The cave is approximately 10 by 10 and 4 high. No one was injured or entrapped. Preliminary diagnoses; 2 supplemental supports in the form of Steel Sets and Beams were unknowingly hit by a trailer, causing steel sets to fall over. This caused the roof support to fail.