I personally drove 1950's 2 tons with a load of 2,000 gallons of gasoline. We ran 60 or so on paved roads. Not that fast on gravel roads, but we did it 5 days a week and always at full throttle. I pulled 8,000 gallons of gasoline and a grain trailer with a 550 GMC. It would run 70 on level ground and a lot faster down hill. Upgrades that are available now weren't invented back then and we didn't need them. We had less wrecker calls back then when everything was mechanical than the new trucks that shut down when a sensor goes out. If you want upgrades, its your vehicle do do with it what you want, but we did just fine with what we had back then. I have had a commercial license for over 55 years and drove several years without a license.
