The heaviest that I have moved were mid-50s Frigidaire TOL with full porcelain cabinets... after moving those, new stuff could almost be forgiven for how cheap (and lightweight) the materials and trim are!
<span style="font-size: 14pt; color: #008000;">The very heaviest fridge I ever tried to move was the original Foodarama. Those big Amana/Maytags ran a close second.</span>
<span style="font-size: 14pt; color: #008000;">These things were beasts! </span>
I forgot about that one... I moved one of those, too, and although it was not a porcelain cabinet, it was a huge and heavy machine that of course had to come up a steep flight of enclosed basement stairs... It was a good thing that there were a couple of guys to help on that move!