Hey J -
I started to reply to you, but got sidetracked...
Dad worked in a tire shop during the 40s-50s timeframe. There for a while, he said those auto-steers were really quite the fad out here in the Texas panhandle.
He said they were great for business for the shop he worked at - because everyone would put the plow in as deep as it would go - and then put the tractor in low and let her rip.
That would work great until it hit a tough spot and started spinning. He changed a lot of tires where it would spin long enough to light them on fire.
He said the very worst was when they were full of calcium for weight - getting that gummy partially burned, calcium soaked rubber off the rim was miserable.
I've heard folks back in those days called them "blind ni***rs"... Not too politically correct, but a sign of those times, I guess...