camper should have an automatic transfer switch between shore power and generator. i have not seen a manual one. you will usually see this in the power bay where the shore power cable comes from.
have you checked the breaker on the generator? usually if you don't have power via generator, it's that breaker on the generator.
next up would be the main breakers from your panel inside the coach.
himcules (10x stronger than hercules)
2013 Forest River Berkshire 390BH-60
ex 2007 Jayco Greyhawk 31SS