Magnatrac, they are still made today, the video is one of the newer ones. They have gotten better.A neighbor of mine 25 years ago had one of those kits that you'd buy out of Popular Mechanics ( remember those ?) . Never looked at it real hard.
Always fixing it, tracks falling off ,something breaking ect. Plus the guy was a real shoe maker.
Ended up back in the weeds somewhere never to be seen again...
You got it. They use to be advertised in all the car magazines back in the early days too.
Struck mini dozers?