3-Point Hitch 3pt supports and their use?

   / 3pt supports and their use? #11  
Maybe bars are sized for Class I sized implements and chains are for Class II..?
 
   / 3pt supports and their use? #12  
Some 3pt attachments needed to move. Such as a 3pt moldbord plow. But it needed chains to stay away from the fires. As mentioned earlier.
 
 
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