I just bought a 2021 Silverado 2500HD CC, Std Bed, Duramax. The truck has a 7 pin round and 4 pin flat electrical connection on the bumper. Can I safely use the 7 pin for a camper and 4 pin to the boat trailer at the same time while towing? I don't have a camper yet but trying to understand boundaries of electrical loads when both are attached to the truck when rolling. Want to avoid surprises and fuses. Thanks!