I Used to be a Tank (Kangaroo)

The Ram Kangaroo was a Canadian Ram tank with the turret removed and reclassified as a troop carrier. It didn't have fancy troop carrier specifics like doors, but there was a giant hole where the turret used to be so they entered and exited via that. There was little room to sit inside and no protection from the weather... but it beat marching. It was used in the Italian campaign and after.
Tank Museum
Bovington, UK