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Mounting a 14' Flatdeck to a Isuzu NPR

Discussion in 'General Discussion' started by Vendeta44, May 25, 2019.

  1. Vendeta44

    Vendeta44 Registered User

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    Hey, Hopefully I found the right place to ask this question. I have a 1986 Isuzu NPR that I'm in the process of swapping a 14' wood platform flatbed onto. I purchased the flatbed used from some junk yard and had box steel cross beams welded between the two frame rails as the frame rails on the deck are wider then the frame rails on the truck.[​IMG]

    The resulting cross beams look like this from the rear and there is 6 of them down the length of the frame. All properly welded by a professional.
    [​IMG]

    There is a slight gap because the torque spring mounts for the leaf springs get in the way so I assume I'll need to use some sort of spacer material, originally I was going to use hard wood but I found a threads on this forum advising against wood, does anyone have a alternative or will wood be okay?

    As for mounting I had intended to use square u-bolts diagonally across the cross beam through the bottom of the truck rails and around truck frame like so.
    [​IMG]

    The catch is of the 6 cross beams only the 3 center cross beams have the room for me to fit u-bolts like this. All the other beams are either blocked by the torque spring mounts, fuel tank, or battery box. I've never mounted a flatdeck before so I'm not sure if 6 total ubolts only in the center of the deck is sufficient to hold the deck safely. I intend to be able to haul loads up to 4000lbs.

    I could fab a few right angle brackets like this to add some sort of mount to the ends of the frame. (you can also see the offending spring mount causing the fitment issue in this photo)
    [​IMG]

    any insight would be much appreciated. Thanks.
     
    Last edited: May 25, 2019
  2. compressionignitionrules

    compressionignitionrules Full Access Member

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    a 1986 Isuzu npr is long ago in the scrap yard in Ontario. I work at a Hino dealer and the GM dealers dump their isuzus on us all the time, they don't even want to work on them but oldest one we see is 2003 and the frames are usually not safe anymore, they look like swiss cheese when new and don't last long here. hardwood "sleepers" are used al all commercial vehicles with ubolts pulling them into the frame. your issue doesn't look like sleepers will help, your frame rails aren't even close.
     

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