don't use rub rail for securement, but what is the underside called?

Discussion in 'Flatbed Trucking Forum' started by DPForumDog, Dec 22, 2022.

  1. DPForumDog

    DPForumDog Bobtail Member

    Nov 13, 2015
    I understand that even though the FMSA rescinded the rubrail rule it is still best NOT to use the rub rail for securement. So what do you secure it to? What do you attach your strap to exactly? Some people call it the under grip, or the lip, or the underside of the trailer.?

    What do you call it?
    What is the proper name of the underside of the trailer where you attach the strap?
    How do you know if the underside of trailer is strong ennough? If the RubRail is supposed to have an OEM WWL rating certification, Shouldn't whatever we are securing it to also have a rating?

    Granny DP

    flatbed flat bed trailer under 26000 GVW bobtail ratchet strap
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  3. AKDoug

    AKDoug Medium Load Member

    Mar 21, 2018
    You are going to get answers all over the place on this. I've owned trailers where the underlip was just as scary as the rub rail. I've had trailers with no rub rail at all and the under lip would kick the strap hooks out at a weird angle. My current trailer eats straps when strapped to the under lip, right where the strap is sewn to the hook. I've had this trailer for 12 years now and the only way I hook my straps is to the rub rail. It's also a 96" trailer that has the winches permanently welded to the side of the trailer with rub rails between the winches. The trailer has a sticker that says the stake pockets and pipe spools on the rail are rated to 6000# each. This has been good enough for every scale guy I've encountered when hooking on the rub rail near them.

    My little hot shot trailer (25K gooseneck behind an F450) also has issues hooking 2" ratchet straps to the under lip and running behind the rub rail. Pipe spools and stake pockets are rated on this trailer as well, so we just hook to rub rails.

    I DGAF what other super truckers and flatbedders think about hooking to rub rails. I've hauled thousands of loads of lumber this way with zero issues over the last 20 years hooking straps to rub rails.
  4. singlescrewshaker

    singlescrewshaker Road Train Member

    Dec 31, 2017
    Little Havana, FL
    Some trailers have a piece of flat bar, steel or aluminum bolted or welded to each crossmember. It is called an "under frame tiedown flat"..


    Otherwise you are usually just going to hook to the deck frame outer rail, or lace rail, which is usually C-channel. On lower end gooseneck's, some lace rail is just 6"-8" flat bar..

    PJ's in particular used to, might still use tube for the lace rail. In which case you can either spec the under frame tiedown flat, or you got to hook to the rub rail. A few chain tail straps come in handy so you can grab pockets & spools as well..
    JonJon78, Cat sdp, beastr123 and 2 others Thank this.
  5. Aamcotrans

    Aamcotrans Road Train Member

    May 24, 2016
    Strasburg, Va
    If the rub rail has a listed wll on your data plate then use the rail
    singlescrewshaker, DPForumDog and cke Thank this.
  6. kylefitzy

    kylefitzy Road Train Member

    Aug 12, 2007
    Kansas city,Mo
    Anchor points are not required to be rated. Where ever a hook can fit, a hook belongs. Never had an issue.
  7. Razororange

    Razororange Road Train Member

    Dec 20, 2011
    Milwaukee, WI
  8. CAXPT

    CAXPT Road Train Member

    Feb 10, 2008
    I would ask you for the cite, but I know where you got it from, and it's from the old text from 2002 currently outdated. Last updated: Monday, March 3, 2014 which you can read here:
    Cargo Securement Rules | FMCSA

    The cite I gave you, is current:
    Which by the way, supercede any and all prior references, when it is stipulated, and a codified section overrules a general description section. They may not have to rate and mark, but as the driver, we are required to know if the structure can meet the requirements of the section referenced by my previous reference which I suspect, for reason of merchantability and reduction of liability, I have seen manufacturers increasing the documentation and marking of tiedown/anchor points with ratings.
    Last edited: Dec 28, 2022
    singlescrewshaker and cke Thank this.
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