I have also been wrestling with the same questions.
My motorhome came prepped for a washer/dryer installation, (except for an external vent). Having to cut a new hole into the shiny new polished and perfectly fine fiberglass exterior wall has been the number one thing preventing me from just slapping a vented dryer in. I have heard that the new ventless dryers and washer/dryer combo units do not produce enough moisture to cause mold.
However, I have seen 1990's 5th wheel trailers and motorhomes with the first generation ventless units full of mold, rotted out ceiling luan. and rotted cabinet wood. Not pretty.
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