Advice Setting up a 24' Flatbed (Curtainside) with a Moffett

Discussion in 'LTL and Local Delivery Trucking Forum' started by SilverBulletBand, Dec 28, 2023.

  1. SilverBulletBand

    SilverBulletBand Light Load Member

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    Truck is a 2012 Peterbilt 24' Flatbed Curtain side. Need to put a Moffett on the back.

    Moffett kit weighs 800lbs, M55 Moffett weighs in at 6200lbs.

    Anyone know the ideal Wheelbase are Rear Axle to Frame End Limits ?

    Wheel base is........................... 257"
    Center of Tandem to Bed End....143"
    Center of Rear Axle to Bed End....117"
    Rear of Tire to Bed End............. 96"
    Truck GVWR is 57,200 lbs 17,200lb Front 20,000 x 2 = 40,000 Rear
     
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  3. Ruthless

    Ruthless Road Train Member

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    wheelbase varies truck model to truck model/
    Rear overhang is specified per the manufacturer of the kits tho////


    https://piggy-back.com/sites/default/files/pictures/Dimensions_StraightTruck.png




    the short version is you want about 90” from the center of the drive axles to the rearmost part of the truck body.

    Also, according to the manufacturer, your rearmost axle has to always be down. That is, You can’t drop a lift axle behind your current drive setup and call it good.
     
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  4. Goodysnap

    Goodysnap Road Train Member

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    Just off the rip, those drive axles look way too far ahead to be hanging that kind of weight off the back.
     
  5. SilverBulletBand

    SilverBulletBand Light Load Member

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    So based on that and the measurements here. How far back do the tandems need to be moved ??

    Wheel base is........................... 257"
    Center of Tandem to Bed End....143"
    Center of Rear Axle to Bed End....117"
    Rear of Tire to Bed End............. 96"

    It did get an Estimate from a local Truck Frame, Suspension shop of around $3000 - $4000 to move the axles back.
     
  6. SilverBulletBand

    SilverBulletBand Light Load Member

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    Also, what about the possibility of reducing weight off the rear and/or adding ballast up front ?

    Could trade in the 6200lb Moffett for a 4200lb Donkey forklift. That would reduce 2,000lbs off the backend.

    What about adding ballast up front somewhere. Where and how could this be accomplished and how much to add to balance the weight ??
     
  7. SilverBulletBand

    SilverBulletBand Light Load Member

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    One concern I have with moving the tandems the WHOLE way back is shifting to much weight to the front tires/axle.

    I was always concerned about this with our current straight truck. It's a 2008 Intersmashable 8600. It was a daycab that had the frame cut/stretched into making it a 24' flatbed/curtainside. Our 6200lb Moffett rides on the rear. GVWR is around 56,000lbs IIRC.

    WIth a full load of around 20,000lbs or so (10 - 1 Ton pallets), the front end always appeared overloaded IMHO. The front end would drop down several inches and the front steers always appeared low on air. Air in them was always good at 105psi or so. View attachment 497974 53324606924_e4e362de90_k.jpg
     

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  8. AModelCat

    AModelCat Road Train Member

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    Refit with a heavier steer axle?
     
  9. Ruthless

    Ruthless Road Train Member

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    Dont add ballast up front: if you dont move the axles to the back youll be dragging that rear tire regularly which will damage more than the tire.
    What you’re describing regarding overloading the steer axle can occur if you do not have the machine on the back and are loading close to gross weight.
    With a 17,400 front axle (sure it aint 14,600? Thats a common one) you should be fine in that respect as far as front axle carriage weight.

    i wouldnt switch out your machine for a lighter one to save on tare weight unless you are consistently over gross weight by that much.

    you need to be between 84”-96” from the center of your drives to the rear of the truck body where the machine mounts. You need 14” of ground clearance on the machine tires when mounted and truck aired up.

    make sure your steer tires are weight rated for the weight theyll carry in addition to the axles & springs
     
    SilverBulletBand Thanks this.
  10. SilverBulletBand

    SilverBulletBand Light Load Member

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    We're sending the Intersmashable to Auction after we get the Peterbilt set up.

    You mean for the Pete ?? It's got a 17,200 in it know. Wonder how expensive it would be to upgrade it. ??
     
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