Enjoying the read. I been slow lately catching up, but we like following you. Good story/history!
I learned to drive at age 9 on the farm for the same reason. Too dang skinny to lift the hay bails onto the truck. The truck I learned on was a converted 1959/60 International dual axle dump truck. 2 speed read and strigt cut gear. Like you mentioned I ended up with one heck of a left leg muscle.