If you are sure the 120v outlet has power, then no ac is a breaker or shore line problem. No dc when there is no ac means your battery(s) are dead and you were getting your dc via the ac power converter.
Can you provide more details? What sort of camper are we taking about, and where & how did you check for incoming power? And did you check ALL the ac and dc lines inside the camper, or just sample a couple? For example, you should check the 120v outlets, fridge on ac mode, and an air conditioner & maybe the microwave to determine if ALL the ac is out or just parts of it. Quite often we find that an initial report of "no power" turns out to be "only some power".