Power seats and windows stopped working at the same time

Okay. So, all at the same time both power seats went out and only the passenger front and rear windows went out. I checked the breakers underneath. I checked all fuses. Everything is good. I hit the buttons on windows or seats, and I get a click sound but no movement. I'm at a loss. This all happened when hooking up a 5th wheel trailer and the trailer brakes on the truck stopped working and said service 4wd. I hooked it to a different trailer, and it was the same. Everything all at once. Any help would be appreciated. Also, my friend has his own shop and is a certified GM mechanic and has him for a loss.