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Why do many of these straight trucks have trailer brakes?

Discussion in 'Questions To Truckers From The General Public' started by RGT766, Mar 19, 2023.

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  1. Mar 19, 2023 #1
    RGT766

    RGT766 Bobtail Member

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    On purplewave.com, several straight trucks are on the auction block with photos of inside the cabs. I'm puzzled as to why so many of the them have the red trailer air supply valve on the dash? Here are five examples.
     

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    RGT766, Mar 19, 2023
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  3. Mar 19, 2023 #2
    VIDEODROME

    VIDEODROME Road Train Member

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    They might tow a trailer even if it's not a 5th Wheel ? Just my guess.
     
    VIDEODROME, Mar 19, 2023
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  4. Mar 19, 2023 #3
    Animosus

    Animosus Medium Load Member

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    Probably have a pintle with air brakes?
     
    Animosus, Mar 19, 2023
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  5. Mar 19, 2023 #4
    Oxbow

    Oxbow Road Train Member

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    The fourth picture shows a fifth wheel switch as well. I suspect it has been converted from a tractor.
     
    Oxbow, Mar 19, 2023
    Oxbow, Mar 19, 2023
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  7. Mar 20, 2023 #5
    ducnut

    ducnut Road Train Member

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    Those appear to all be converted from semi-tractors.
     
    ducnut, Mar 20, 2023
    ducnut, Mar 20, 2023
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  8. Mar 20, 2023 #6
    wulfman75

    wulfman75 Road Train Member

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    when I was doing expediting my straight trucks were converted tractors so had all the stuff a tractor would have.
     
    wulfman75, Mar 20, 2023
    wulfman75, Mar 20, 2023
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  9. Mar 24, 2023 #7
    RGT766

    RGT766 Bobtail Member

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    I was obviously thinking they were converted but I was thrown off by the Freightliner flat bed. There is a pic of the axle numbers, supposedly factory printed on the body which indicate it was originally built with 4 axles.
     

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    Last edited: Mar 24, 2023
    RGT766, Mar 24, 2023
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  10. Mar 24, 2023 #8
    Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Trucks are built by the manufacturer, and the body manufacturers put the bodies on. Trucks are built for multiple jobs, not specifically boxes. And yes, they could still pull trailers if equipped with pintle hooks.

    Think cab n chassis pickups
     
    Big Road Skateboard, Mar 24, 2023
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  11. Mar 25, 2023 #9
    AModelCat

    AModelCat Road Train Member

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    I'm reading that as the truck was built as a tandem with 40k lb rears and a 12k lb steer axle.
     
    AModelCat, Mar 25, 2023
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  12. Mar 28, 2023 #10
    RGT766

    RGT766 Bobtail Member

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    Yes, 3 rear axles
     
    RGT766, Mar 28, 2023
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