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Something else occurred me to. The current MN Military Vehicle laws state that if a vehicle has a civilian equivalent it can be registered. Otherwise they have a system where (former) MV are supposed to be owned by a non-profit with a special registration. I don't know anything about the M35...
Y plate is any vehicle that is 10k lbs or higher. They can be registered as non-commerical. Since a 5-ton is 10k lbs (I assume that is Max GVW?) then it would get a Y plate. (Ford F350, Chevvy 3500, etc all get Y plates for the same reason.)
As mentioned definitely check local ordinances...