go with the smallest REAL dehumidifer you can find at a big box store, around $100 typically. Usually holds 3-4 gallons, don't ask me how many pints that is.
We've used on for years, when first turned on it will pull two buckets full out in 24 hours, roughly 5-6 gallons of water. they run a compressor, basically a a/c unit, water condenses on the cooling coil. they will also give some heat to the trailer.
unless your in a real dry climate, stay away from the thermoelectric units, they can't pull anywhere near the water out that you need.