to me the terms R.V.(recreation vehicle) and motor home are synonymous.
this is a unit that has both an engine and living quarters...but i do not have a washing machine. I have heard of Airstreams that have bath tubs, though!

here is the small er type www.vixenrv.org

and the larger one..twice the size..
http://www.rvusa.com/rvinventory_item.asp?id=535301