A plan was devised in 1943 to invade Norway and a cargo carrier that could travel over snow would be needed.
There was a towing pindle that could be used to tow artillery.
The M29 had a very low ground pressure and was sometimes used to cross fields with anti-tank mines as it wouldn't set them off.
At the front and rear were flotation chambers.
There were two rudders for steering in water.
The M29C could perform well in smooth water.
The tracks were flexible to allow for propulsion through water.