Half-track jeeps
Snowtractor T28, or "Penguin jeep". Note 40-prefix, used for half-track type vehicles. This specific vehicle has survived and is now owned by a famous British collector. It made its first public appereance during the 2003 War & Peace Show at Beltring.
Snowtractor M29
Snowtractor M29E1
In 1942 the military started experiments with halftrack-jeeps, mainly for use as rescuevehicle in snowy areas. All sorts of  systems were tried, but the final model was the Allis-Chalmers M7 (T26E4), which used a lot of standard 1/4 ton parts, including the complete engine and gearbox assembly. It was used next to the Studebaker M28 "Weasel".
The final product: Allis-Chalmers M7