We have the stackable Whirlpool in our rig. Like having them as we can take fewer clothes on a trip, just throw some in while setting around. Our next rig will have a stackable too, but it will not be a Whirlpool. We will get a Splendide. Found out the hard way that Whirlpool will not warranty their RV washer/dryers because they are used in an RV.
Also, if you have yours dealer installed as new units, make sure they are new. There are dealers who will sell them as new but are using remanufactured units instead.