In fact, GMC trucks were presented the E Award for Excellence in 1944 because of its help in the war effort. The next war also seemed to benefit GMC as their production numbers continued to escalate with all of its trucks going to the war effort by 1942. By 1923, GMC trucks had capacities ranging up to 10 tons if you counted the trailer.
The following year electric lights replaced what had been oil lamps as standard gear on all trucks as well and seven speed transmissions became the standard for heavyweight trucks. GMC Trucks After World War I. GMC delivered 8,500 vehicles to the Army during those years.
They added Reliance Motors to their inventory in 1911, and in 1912 GMC (General Motors Corporation) Trucks was born out of those two acquisitions. It had its beginnings with a commercial hauling truck company created in 1902 by Max Grabowsky called the Rapid Motor Vehicle Company.