TL*THE CONTACT OWNS A 2007 GLADIATOR CUSTOM TRAILER. A 2007 GMC 2500 HD. WAS PULLING THE TRAILER. WHILE TRAVELING 55 MPH, THE TRAILER STARTED TO SWAY. THE TRAILER BRAKE WAS APPLIED AND THE TRAILER WENT OUT OF CONTROL. THE TRAILER BECAME UNHITCHED AS THE TRUCK SLID SIDEWAYS ACROSS THE INTERSTATE. THE TRAILER HAS NOT BEEN DIAGNOSED AND WAS TOWED TO PRIVATE PROPERTY. THE FAILURE AND CURRENT MILEAGES WERE 100. A POLICE REPORT WAS FILED.