Correct vehicle and/or trailer deficiencies by removing, repairing, adjusting, overhauling, assembling, disassembling, and replacing major assemblies, sub-assemblies, components, parts, or systems such as power and drive trains, electrical, air conditioning, fuel, emission, brake, steering, hydraulics. Complete machine shop operations and make adjustments and alignments including bearing loads, gear tooth contact, valve mechanisms, governors, oil systems, control linkages, clutches, and traction units.