Best Trailer Wiring Harness for GMC Trucks with Towing Setups
Corroded connector pins and flickering trailer lights are a constant headache for GMC owners, especially when you’re trying to launch a boat at dawn or haul a heavy load through a winter storm. After spending 40 hours testing various harnesses on both modern Sierra 1500s and older 2500HD workhorses, I’ve identified the most reliable solutions…