P.S. At the same time, it was this type of machine that was always fun to find in someone's home -- there was a kind of twisted delight in seeing the oddest, loudest or ugliest vacuum cleaner!
I remember a lady who had one of those Whirlpool "Convert-a-Vac" or whatever they were called, basically a canister cleaner with a revolving brush and detachable handle. It was ugly, loud and hard to use -- it was so delightfully awful that it was always fun to see, and to hear her cussing at it! Same for the KenCarts (hi Hans!) -- ridiculously big and hard to maneuver around most homes, but a lot of people had them!