military expandable semi trailer insulated with locking doors and windows. expand to sixteen feet wide. has heaters. box is on a skid and can be removed from trailer. It also can be put back on the trailer and hauled off. box skid is 17 ft 6 in Long. box skid with heater box on top 20 ft in length total trailer with box is 28 ft. expandable boxes 8 ft wide closed 16 ft wide open.