Carriages - There are actually 4 sizes of hook type tine carriages rated by the tine carriage lifting capability. Hook type fork carriages have been standardized.
Class I carriages are rated for cargo as much as 2000 lbs. The carriage bar spacing utilized for Class I is thirteen inches. Class II carriages are rated for loads as much as 5,550 lbs. Their carriage bar spacing is 16 inches. Class III carriages are rated for loads up to 10,000 lbs. The carriage bar spacing for this class is twenty inches. Class IV carriages are rated for cargo up to 15,500 lbs. The carriage bar spacing for this capacity is 25 inches.
Pin mounted blades vary by the amount of offset between the tine and the fork eye. Various makers will differ the carriages for pin type forks. Carriage capacity would be determined by the carriage pin size and by the tine size.
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