82 tons isn't a full load, but might be on the edge of making it non-stop. It might depend on winds and destination WX. When I flew there, I never went non-stop HKG-ANC. The plane was always full to the gills. We usually landed at KHV at max-landing weight.
There was one plane that was only a nose-loader. Not that useful, as freight being loaded through the nose has a maximum height that is lower than freight loaded through the side door. If I remember, the nose loader was used only for military charters, where the didn't need the height.
There were several airplanes that were factory freighters (not conversions) that had both a nose door and a side door. When you had loaders that knew what to do (say at NWA in ANC) they could unload and load the plane very quickly.