The Sno-Train and the Overland Mark 2 tires garnered a great deal of attention. Why shouldn’t they? the Firestone 120x48x68 tires are 4 feet wide and 10 feet tall. They were inflated to 20psi at the factory, but more commonly at around 7 to 10psi depending on terrain conditions. In this image, you can just make out the walking beam connecting the two tires together on the Mark 2.

Standing in front of the Overland Mark 2 tire. Image: Vic Vessakosol.