What tanks are these?

[David Herbert]

They are M10 GMCs but with an added superstructure that was certainly not a recognized modification. There were standardized deep water fording kits available so I doubt if there would have been any point developing another version. Although an M10 is lighter than a Sherman I doubt that that box would have increased the displacement enough to make it float (like a DD) and the only other thought that I have is some sort of BARV, but the lighter weight would count against that as it would reduce the traction in the water. I will be fascinated to read any other ideas.

David