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Old 05-16-2019, 05:05 PM   #1
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How to determine 2" fwd of rear axle for 5th hitch?

I upgraded my B&W Companion base (nothing wrong with it, just wanted a newer style shiny base with the spacers) and was trying to figure out the best way to determine the point 2" in front of rear axle. I've done it before with a plumb line across the bed rails to the wheel and a straight edge on my 2004 GMC Sierra 2500HD, but always looking for a better way to do things. What is your method?
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Old 05-16-2019, 05:09 PM   #2
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I don’t have a 5th wheel, but your method seems like the easiest and most accurate way. Makes TOTAL sense to me. I can even readily picture your process.
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Old 05-18-2019, 11:31 AM   #3
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Sometimes simple is the best method. If you want to crawl under and do measurements ,measure from one of your existing mounting bolts to the axle C/L. using a plumb bob. Now go top side and duplicate the measurements.

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Old 05-18-2019, 01:24 PM   #4
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Back into the garage, perpendicular to rafters. Hang 2 plump bobs, one to center of bed, one at edge of bed..

Push truck till outside bob, is at axel center. Measure 2” on floor.

Push truck back 2”.

Inside plumb bob is now 2 “ forward of axle.
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Old 05-18-2019, 02:27 PM   #5
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It all depends on the mountingmplates. All of them will attach to predrilled holes in the frame. That is going to dictate your mointing.
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Old 05-19-2019, 09:01 AM   #6
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Thanks for the inputs. I painted some thin lines in the bed to mark the axle ctr and hitch mount ctr so if I have to do it again for some reason I won't have to get the plumb bob and squares out!! I also determined my old hitch base was centered 1/2" fwd of the rear axle. Best I could do with the new base was 2 1/2".
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