Hi-Lo, 2311H. Dometic/Duotherm 13,500 btu Penguin A/C unit. Often drips on floor through filter. Tried all the recommended things to check. Drain holes clear and clean. Trailer level. Fan on high and temp adjusted to cycle the compressor on and off. All trays, pans and tin in the right place. Condenser and coils clean. We are out for a week now and its dripping again. I did an internet search on the problem for the 100th time and found this. On some other forum a guy with a new trailer had done all the same things.
Any way the guy took off the interior part from the ceiling. Stuck his arm up into the unit to check something, tripped or stumbled and his whole A/C unit on the roof moved. The mounting bolts were ready to fall out.
I took my interior cover off and found the mounting bolts only finger tight.
I torqued them down and compressed the gasket to 1/2 inch and problem solved. The problem was hot outside air coming in past the gasket hitting the cold side "radiator" and condensing.

you saw & read this thread as well? http://www.hilotrailerforum.com/f29/...s-inside-2062/

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From Kansas: 29ft '95 5th, converted to toybox in rear, by Hilo. Pics soon, Some Here.