World War II Jeeps had 6.00x16s with what was referred to as a non-directional tread (NDT) design. Later, Jeepers referred to these tires as grave diggers for obvious reasons.

Yokohama Off-Highway Tires America, Inc. The puncture-proof solid construction of the Giraffe ND SDSA features a non-directional block pattern. Yokohama-ATG ...