Your box length will depend on the trailer you want to pull. The fifthwheel or gooseneck ball should be directly above or slightly ahead of thre rear axle. You have to leave clearance enough for the trailer to turn. A gooseneck equipment trailer with a narrow neck does not need as much clearance as a box trailer with a square front end.
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AndyG
1989 FLD120 with 2000 NRC conversion
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