Trailer Systems Diagnosis and Repair: Diagnose and repair key trailer systems, including brakes, suspension, wheel-end assemblies, landing gear, electrical and lighting systems, air systems, doors, liftgates, and structural components. HTI has grown over the years through its five divisions: New Life Transport Parts Center, Road Equipment Parts Center, Pace Transportation Services (2012), Martec International (2019), and US Trailer Parts and Supply (2023).