If you have a sliding hitch you don't need the exstended pinbox. On the standard 8'W trailer you only need to be 4'+ back with the center of the hitch. If you have a wide body then 4' 4" or so. Go to a dealer with a modle hitch where you will be able to see how much the slide moves the hitch back from center axle and you will be able to do the math yourself.
Rick
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