After getting some good floridian advice my first summer down here I bought a de-humidifier to assist the A/C.
Wow, air on and still that dehumidifier was filling cup after cup of water. I finally had to run the drain hose to the shower!! But like said it did make a 'big' difference how cold I could get it in the MH, parked in the sun in 98 degree Florida weather.
What I also learned is to get to the store BEFORE the snowbirds head back home. The shelves at Lowes were completely empty of de-humidifiers.
Store manager said all the Snowbirds buy them for their stored MH's, Park Models, etc. that they leave closed up for the winter.
So although not a scientific study but with all the dehumidiers sold out come May, guess most DO use a de-humidifier for stored RV's and closed up winter homes. :B