As a long time apartment dweller washing and drying machines mean little in my life. I could put a W/D in my current apartment but the additional cost of property insurance (we own the apartment), re plumbed water service and upgraded electric service, increased water cost and need for plastering (yes I need to plaster not sheetrock) doesn't make it worthwhile it for me.
As such this is not even close to an amenity I'm interested in within an RV which would have much the same concerns but in a smaller space.
I have no problem using a laundromat wherever they are located.