FreightClass requires the values to be formatted in a special way.
For example, the value for class 500 should be written: CLASS_500
And for class 92.5, it should be written: CLASS_092_5
Full list:
CLASS_050
CLASS_055
CLASS_060
CLASS_065
CLASS_070
CLASS_077_5
CLASS_085
CLASS_092_5
CLASS_100
CLASS_110
CLASS_125
CLASS_150
CLASS_175
CLASS_200
CLASS_250
CLASS_300
CLASS_400
CLASS_500