To the OP, I can definitely see the advantage of having a stackable washer/dryer if you have a lot of laundry to do. We have a Splendide VENTED combined washer and dryer in our coach we purchased in May. This is our first Class A, so we've never had the option of doing our laundry "at home" before.
The original owners of the coach bought new in 2002. Lived in it full time until we purchased it. The finally replaced the original Splendide with another just like it in August of last year, after over 12 years of service. It had finally failed. Funny thing, they had it all that time and never realized that you could set it to automatically go into the drying mode after the wash mode completed!
Since it's just the two of us, we do a laundry load every two days or so, just fire and forget.
Anyway, to recap, the original VENTED Splendide lasted for over 12 years of Full Time living.
By using a combo unit, we gain the storage space of the entire 2nd stacked unit.
We don't have the extra weight of the top unit. (saving it for more STUFF!)
I haven't heard of any Coach that comes "prepared" for a washer that WON'T fit a Splendide. It's all about choices . . . .
Just remember to chose a VENTED, NOT a Ventless Splendide!
Scot & Laura Kellersberger
2001 Newmar 4 wheel drive Dutch Star 3891, 2005 GMC Canyon. Demco Tow Bar & Baseplate U.S.Army (ret) 1985 - 2006