I posted in "spotters" because I was hoping a "spotter" had spotted it and could confirm my suspicions. I am not a spotter, nor an expert nor a pilot (just an enthusiast) so I make no apologies for not being 100% on what plane it was. It fit all I knew about the DC-3 hence my guess, however, I am not familiar with all the twin prop tail-draggers out there so I was hesitant about making a positive identification. I've seen how people can be torn apart on this forum for presuming.
PS Yes, it fit all the descriptors you used, tail-wheel, slow, very slow, large fuselage and very loud, however, as I was looking at it from behind, (yes it was THAT low), the swept wing was difficult to see.
<edit: added the PS>