Most generators with more than 3000w output are suitable to run all the appliances of a camper, however many campers also have an air conditioner. A 13,500btu air conditioner needs approx. 2800-3000w to start with a continuous running wattage of 1500-2000w. A 15,000 btu air conditioner needs approx. 3300-3500w to start, with a continuous running wattage of 2000-2500W. Check the power requirements of your air conditioner before making a choice of generator