WOW! A flat field to load bales!
Most of our hay ground was rolling, to downright dangerous.
And we almost always racked with the wagon attached to the baler. That saved having a kid or two walking along picking up bales off of the ground. I got pretty good, with both hands, using a bale hook. Once a guy gets used to the hook, he feels lost without it.
We sometimes used an old flat bed truck to pick up hay, and around age 9 I started driving it. The truck was left in first gear and I was told to use the clutch only. To go, let the clutch out slowly, to stop just push the clutch in. On level ground it would come to a stop in a couple feet.
All went well until the day we were in a hilly field. Someone yelled 'stop', and I dutifully pushed the clutch in... and the truck went faster. Someone finally ran up, reached in and turned the wheel. All the loaded hay fell off but at least I didn't kill anyone. /s