We just traded for a coach with a stackable washer/dryer set up. We had always told ourselves that we would not want/need a washer or dryer in a coach. However, the DW has fallen in love with the set up. They are the Splendide Ariston (sp?) units so not as large as your average residential units but they work just fine. The washer spins fast and gets the clothes pretty dry. The dryer is 120V so it takes a bit longer than a 220V home dryer.
DW washed a set of king sheets/pillow cases in the set up and it worked just fine. We were able to do all our laundry, smaller loads than with the w/d in stick home but still better than going to laundromat.
Really big, bulky items like a bedspread or maybe a heavy blanket might still require a trip to the laundromat.