Forum Discussion

prk7's avatar
prk7
Explorer
Aug 13, 2016

Fifth wheel pin box extension

Are there any drawbacks of adding a ten inch pin box extension to a montana 3791?

17 Replies

  • Turning 90 seems to be over-rated. How often do you do it? If you can do it, that will put terrible stress on the rear axle and tires as they slide sideways.

    Why????
  • Yes you are correct just measured the pin box, it must be long pin box, a ten inch extension would cause back of box to hit truck rail. I'm using Andersen ultimate 3220 hitch, pulled fine from Michigan to Georgia, but can't turn ninety degrees, don't want to wrestle with heavy slider.
  • According to Keystone website it has a GVWR of 17K and a pin weight of 2945.

    And I think it already comes from the factory with the extended (long pin box. So are you wanting to go even longer?

    Is so a sliding hitch is probably a better choice.
  • You have not given the FW GVWR, or the current pin wt. Many lighter, and middle weight FWs come with an extended pin, to work better with 6.5 bed trucks. I'm thinking that Montana is fairly heavy, and an extended pin would not be recommended. JMO, still best to ask manufacturer.

    Jerry
  • It looks less stressful then the reese sidewinder and yes I have short bed
  • MFL wrote:
    The obvious answer would be added stress to the pinbox and frame that supports it. I would check with the manufacturer to see what they have to say about it.

    Jerry


    Come ON give the guy a break! If it was OBVIOUS he would not have asked the question. These forums are to exchange information.

    I do agree that checking with the manufacturer is the best place to start. Also if you need it for a short bed truck a sliding hitch also may help.
  • The obvious answer would be added stress to the pinbox and frame that supports it. I would check with the manufacturer to see what they have to say about it.

    Jerry