Our FW came plumbed for a combo washer/dryer with external vent and we negotiated a unit in the purchase.
We have used it, but there are some drawbacks.
- It can only wash/dry small loads.
- It takes *FOREVER* to dry.
- I can feel the whole trailer wiggle when it is running. (this has been reduced since I added stabilizing jacks under the trailer)
- It adds a small effort to the winterizing process.
On our longer trips, we do still wash from time to time. But even having this installed, we also occasionally use the camp laundromat.
To do it over, we would skip the washer in favor of the additional closet space.