You are right Douglas. According to the manual the grousers were meant for when the ground would not provide adequate traction (I think they used the term boggy) and were not for use on hard surface. If they did have to be driven for short distance on hard surface, speed was limited to 10mph.
Our carriers had racks on the sides to hold these things. I can't say I ever saw them installed outside of a track course. It was usually too cold to be doing a lot of optional maintenance during the winter months.
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