We started with a Splendid single vented unit in our first fiver. We thought that was a better way to go because you could just put in a small load and forget about it.
In our present fiver we went with side-by-side Splendid units. They are pretty large and the dryer is vented. We actually like this set up better because we can do bigger loads.
We are full time and there was no way we would be without a washer/dryer in our rig. The first couple of months we had to use a laundry mat and that was not a fun experience, plus expensive.