Question: are campers 120 or 240?
Answer: They use either a 30 amp dryer plug or a 50 amp range plug. Some RVs do have 240 volt appliances like electric heat and water heating. ... Some larger RVs have the option of a NEMA 14-50, 120/240V split phase 50A service. That outlet will provide 120V 50A on two separate pins, referenced to neutral.