So Ive noticed that every time I connect my boat trailer to the 7 pin, my truck cycles with what sounds like a relay in the engine bay every 20-30 seconds and makes this clunking sound. Truck is off and only unplugging the trailer will make it stop.
Your not alone. I ordered a 3.5 Plat with Max Tow and work surface. Ordered back in Sept. I also have a vin and a 2-1-2021 build date. Seems like all of us that ordered Max Tow now have the same build date or just somewhere to put us all. Just reading some of the other threads, alot of people...