TBI Journey
I bought the EDV-1100 for our 23' Retro to deal with condensation problems, wanting a quieter and smaller unit than those with compressors. We are already very careful to use exhaust fans for showering, cooking and microwaving but live on the Olympic Peninsula of WA with daily outdoor humidity levels in the higher 90% range this time of year. The EDV-1100 was dropping the humidity level a few points, from the high to the mid-60s, but we were still having condensation on our windows. I added the EDV-2200, figuring I didn't have enough capacity. With both we were still in the 60s most days, so I did a test. I ran the 2 EDV units at the same time for 30 hours. The 1100 removed 1/3 cup of water, the 2200 1 cup. I then ran our GE 30 pint dehumidifier alone. Our humidity level dropped from 66 to 40 in first 3 hours of use.  In 27 hours it was full, removing 8 pints of water. I guess we'll need to put up with the noise and larger footprint as we have to keep the humidity down in our Retro to prevent mold. We're running the fan on it on low and it is not running all of the time to keep the humidity level in the 40s. 
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dwight.hughes
We use a similar unit to the EDV-1100 that you mention, we paid $25 for it on Amazon.com and it works fine for maintaining a dry trailer during the storage months.  We had been using DampRid moisture crystals before that and they work about the same actually so probably there was no real value for us switching.  I agree these small dehumidifiers really are not up to the task of drying out a wet trailer, like one in use while camping.  They just don't circulate enough air through the unit.  We live in Washington and so usually camp in pretty wet conditions.  Using microfiber cloths for wiping the windows inside and some propane heat seems to do a pretty good job.

TIP:  Our secret weapon for humidity inside is running the AC on low.  Sounds crazy but it really does take the moisture out of the air pretty quickly.  We've even had the AC and the heater on at the same time.
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TBI Journey
The AC is a good idea, I've used it in cars.  The dehumidifier puts out cool air so the AC wouldn't be much worse.  Will have to remember that.  We're in our unit full time (other than a bit of house/dog sitting) until our home is built, probably later spring. We're happy to get things under control, with daily outside humidities in the upper 90s opening vents isn't an option.
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sunvalleyjoe
Jeez when the humidity gets over 20% in Nevada everybody complains. 100 deg and 15% humidly is bad enough. Our younger son moved to Seattle area and loves it cept the weather. GBA!!SVJ
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