The answer depends on your personal situation...
Our MH has a washer dryer and our previous fiver had one. There was a time when we were still working and didn't have a washer dryer. We had to pack enough clothes for 10-12 day trip which meant two days of washing when we got home or take a "break" at the Laundromat during the trip. You waste a good half a day watching out of control children run around, reading three year old magazines, getting you clothes ruined by 700 degree dryers or using a washer last used by the local mechanics wife. Been there done that.
We are now retired. With a washer, we can pack three days worth of clothes and stay out for a month. We can even run the generator going down the road and do a load. We usually do a load a day. We wash the towels and sheets before coming back and only have the dirty clothes on our back we when we come home. We are minimalists. We don't do fancy restaurants. We hike, bike, ATV and Jeep. I personally don't care if the guy next door sees me in the same clothes for several days in a row. Unknown to him they are clean every day.