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alexleblanc's avatar
alexleblanc
Explorer
May 25, 2016

how much pin box movement is normal?

I see this posted somewhat but I can't get a clear answer - my unit it still basically new I noticed that then I hook it up the distance from the bottom of the front cap and the pin box (checked pin box torque and its right on)gets closer by about 3/8" - 1/2" and while driving I can see about another equal amount of movement - I have one of those pin mount RV levelers mounted up there and its actually slightly scraped on the bottom of the front cap and the measurement is exactly 5/8" as far as I can tell.

I'm going to hook up the truck tonight and take some pictures and measurements.

here's a picture of the said level gauge that really helps me see the movement:



Alex

12 Replies

  • I would say normal. Metal flexes... Nothing is entirely rigid on any trailer so some amount of flex (1/2" or so) is expected. More than in inch I would be a little concerned. I had the exact same situation where my level (mounted in exact same spot as yours) made contact with the bottom of front cap while towing. Bout 1/2" gap while sitting unhooked.

    Most just don't notice the movement/flex but since you have your level there it becomes more apparent.
  • AFAIC there should be no movement. Any movement indicates flex somewhere and that means it isn't as solid as it should be. The amount of movement you've indicated points to a problem, maybe not serious yet, but as things flex, bend, and fracture it will surely get worse.