Fifth wheel position

Discussion in 'Heavy Haul Trucking Forum' started by W923, May 12, 2022.

  1. W923

    W923 Light Load Member

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    To anyone running 4 axle tractors, how far in front of the center of drive tandem is your fifth wheel? I realize the length of the trailer neck is important in this, mine is 120 inch swing clearance. The truck is around 240 wb with 20 k front and 46 rears. I can’t decide on what pusher to use but I just want a starting point for the fifth wheel
     
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  3. Oxbow

    Oxbow Road Train Member

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    With the tag down I run pretty much centered over the front driver. I don't have a heavy steer axle. With 80 psi on the tag it will be close to 11k and the steer 12k. I don't have air ride driver suspension. My tag spacing is 5' ahead of front driver.
     
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  4. kranky1

    kranky1 Road Train Member

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    Might want to start with a truck long enough to put a lift axle on. I don’t know about your regs there, but a lift on that truck here would be useless. Too short inside to get any weight on the lift. You should check your regs for minimum internal bridge before you make any moves.
     
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  5. W923

    W923 Light Load Member

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    In Illinois you need 8 foot from the steer to the first rear to satisfy most permits. It would be useless for anything other than permits here.
    I really don’t know how I would ever get around with something longer. Hopefully this isn’t to bad.
     
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  6. kranky1

    kranky1 Road Train Member

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    There’s a company in Quebec that moves a lot of concrete beams and things. Windmill stuff now too. They had trouble spec’ing lift axle tractors around all the different jurisdictions they operate in. They went to modifying the tail of the frames on the trucks and using pin on axles like a double-drop or lowbed. They have a lot better luck for permits and weight with those. Might be worth looking into reg wise for where you are. That takes the internal bridge measurement right out of the picture and doesn’t add much wb.
     
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  7. W923

    W923 Light Load Member

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    Interesting idea
    How do you get enough weight on the drives or maybe they have really long neck trailers?
    I often have to deliver to off road type jobs so idk how it would work but I will give it some thought
    Thanks
     
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  8. shawnhhllc

    shawnhhllc Light Load Member

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    I have tan them centered over the drive. If your trailer has adjustable pitch you can change the pitch of your trailer casting more weight forward.
     
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