The first dishwasher my parents owned was a top load portable Kenmore with the Roto-rack.  Because of it's design, it could never be permanent installation. The top circular rack was divided into two halfs.  Each side of the round rack was able to fold over (one at a time) for loading/unloading of the lower rack.  Many years before the term and concept of "Bob Load", we had been overloading that machine (LOL).   Now I understand what we were doing and the challenges that the dishwasher faced on a daily basis.  Everything always came out clean.  Never required a repair.  I think my dad bought it used for $35.  It was a great dishwasher.  Seems to me they left it when they moved.