NaViDa.......Some terms are getting confusing here. In your coach, I'm guessing, you have a spot for a machine about 36"T x 24"W (approximate). In years past, when they began offering washer/dryer units in RV's, they offered just a SINGLE unit that first washed your clothes and then dried them in the same unit. This is probably all you have room for. It was also called a combo unit because it could wash and dry.
Splendide is probably the most well known name for these combination washer/dryer units. Early Splendide models vented internally and were really slow to dry clothes. Later they began selling the vented version which vented to the outside of the coach. They worked much better for drying.
In the last few years, most RV manufacturers began making room for apartment sized stackable units (two separate units). These were referred to as stackable units, but may be called combo by some.