We've had the stackable Splendide Aristons for 7 years now and they are perfect for us on the road. If you have the room for stackables (ours are actually side by side now), I would go for those. The Dryer is 110V so its slow, but will work off 30A service or even a generator if necessary (done that going down the road before :)), but the Ariston dryer capacity is nearly two wash loads of the Ariston washer so if the first load isn't quite done, just add the second and move on with the next load.
PS, never had a failure with these, and they are designed for RVs (low water consumption, high speed spin to assist with drying, floor brackets, etc.)