Combo Washer Dryer

We are full-timers and are thinking of getting a washer dryer combo unit. I would like to know what percentage of full-timers have a washer and or washer/dryer combo unit in there RV. I am trying to figure if it is really worth getting one. We know what we want if we get one. Also, I know that it can not be used if you are at a CG that has no sewer, and you would have to use pay anyway.
Thanks for your input.