I had a set of those michelin radials on a set of the 16.5 tires. Pretty sure they were just someone's last ditch effort to keep using the 16.5 rims by using some rubber off an old motorhome.
The trailers were purchased to compliment the gas 5/4 ton fleet. The idea was that you didn't have to carry a spare, but rather could use the spare from the truck. Later, we started installing spare tire brackets and spares on the older M101 trailers. Both fleets of trailer stayed in service until the mid 90s, at which time the manacs were around 17 years old, and the oldest of the M101s were around 40 years old.
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