We don't. Storage IS at a premium, we boondock 90% of the time therefore it would use up all our water (and not sure the dryer would run on a generator). I LOVE going to laundromat and having everything done in 2 hours.
Here's food for thought.....are you planning to go to RV parks??? We've seen in the RULES of a couple of parks that we're not to use our washer/dryers (if we have them). I can imagine it takes a lot of electricity and the smaller parks may have septic problems if everyone used them. My guess...not sure why.