For some reason Denman chose to use a 7.50X20 NDT Mold that is the better part of 2" smaller in diameter than US Royal, Uni Royal, and the diameter of STA.
Military Tread (NDCC and NDT do differ in diameter with commercial tread counterparts. The STA is the only brand 7.50X20 NDT that is in production in the USA. The other made in USA brand 7.50X20 NDT mentioned such as US ROYAL, Uni Royal are long out of production and a chance encounter.
If I were going to use my G-506 Truck on long over the highway trips, Commercial Tread 7.50X20 tires would be the choice, they are quieter and wear better.
Post War Chevrolet 4X4 and CCKW trucks with civilian tread were a common sight on military bases.
PROUD 2011 MVPA PIONEER AWARDEE-HONOR GRAD WHEELED VEHICLE MECHANIC SCHOOL 1960- US ARMY ORDNANCE SCHOOL(MACHINIST) APG 1962 - O-1 BIRD DOG CREWCHIEF - 69 NONSTOP BY THE BOOK ARMY TRUCK-JEEP YEARS LIFETIME AM LEGION DAV 40/8- MVPA 1064 -7 TURNKEY MV'S