No external harness
Means no body control boxes in the cab, better visibility and safety. Better, simpler wiring means electronics-related mishaps are less likely to occur on route. Elimination of over 800lbs of wiring increases payload capacity. No spliced-in wires, and elimination of over 800lbs of wiring simplifies maintenance. No exposed cables to damage. Two engineered harness pass throughs make trouble shooting easier to perform, reduce likelihood of maintenance errors. Watertight anti-siphoning soldered connections prevent corrosion. Fewer body builder-caused wiring errors means fewer electronic repairs needed. Companies won't need to drill holes in cab for wiring, compromising truck strength and integrity.