Remember, in a camper, even when you are connected to 110, all the lights are normally 12v. They are just running off the converter instead of the battery.
Old camper I have doesn 't have a converter. It is straight 110 volts right into the single 15 amp circuit breaker and out to the 110 stuff ( 2 lights and a few outlets ). Built in 1973. Camper is called Tag - A - Long.