The ac unit that comes in most rvs will work, turn the thermostat up and run it some. Never used it in camper but have one we use I. The old house some from big box store worked good there. StNd up model plugs into 110 outlet. Worked very well
Got this one off Amazon back in the summer very quiet operation and has done a great job keeping the humidity down in our 18' camper. Automatic shutoff in case you happen to forget to empty every few days. Bought it off Amazon for less than 50 bucks I think