Here is a good shot of the best improvment you can make on that frame.
"Down unders" shot stolen from his album.
15" to 18 " longer than stock is the general concensis but this one is 24" longer than the stock position.
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I also extended mine for better towing manners and backing up is much improved as well.
Here is mine
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I originally stole the idea from "Nobody" thanks Harvey
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I camp with Tim all the time and here is his
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While you are at it might as well put on a rear hitch
Makes a nice class two 1 1/4" receiver.
I did similar but made mine a class three 2" receiver.
These are great for bicycle racks or cargo platforms .