JM2500

I've got a 2020 Silverado 2500 and the only lights working are the camper lights. No lights on the boat trailer or two different utility trailers. All trailers work fine on four other trucks. Had it at the dealership today and they tried to tell me it checked fine on their machine, and they didn't see a problem. I'm furious. Had I known I couldnt tow with this truck I never would've purchased it.