never heard of a built in dehumidifier for a trailer. I suppose they probably exist as part of an HVAC system for a big 5R or class A?
Get a 90+ pint compressor driven free standing unit. Plumb the drain through your floor (with heat tape), so you don't have to worry about emptying the bin every few days.
Mine works great in the winter, and in the summer - helps the rooftop AC work better when it's muggy. Even without drying clothes, just me and the dog would steam up my little trailer in no time just by breathing / sweating.
Edit: the do exist, but wow the cost!
Aprilaire inline dehumidifier
Just plumb that into your duct system I guess?
