55 ton RGN Lowboy Capacity

Discussion in 'Heavy Haul Trucking Forum' started by JohnIC, Dec 24, 2023.

  1. JohnIC

    JohnIC Bobtail Member

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    Location is Canada, Alberta

    Looking at Triaxle 55ton rgn lowboy to move my machine around (42ton).
    - Trailer tag plate says GVW 55ton
    - Each axle rating is 10.5ton x 3=31.5 ton

    Tractor is tridrive T800, isx15 600 with 18speed. 20k (9.5ton) front and 69 (31ton) rear.

    Locally I am allowed 27ton in summer/winter on each tri group. I can plate to 63.5ton at the registry.

    - 9.5t front + 27t rear drives + 27t trailer tri axle= 63.5ton GCWR
    - Tractor is 10t + trailer 10t=20t tare, so payload 43.5t +/-

    - Adding tandem jeep will add 21ton capacity same with tandem booster, so total 21t+21t=42ton (minus weights of jeep and booster) added capacity.

    Question is, what's the heaviest I can haul when i add jeep and booster, but RGN is rated to 55ton.

    My understanding is 55ton would be max i can load on the trailer, regardless of additional axles. However, I see guys move much heavier loads the more axles they add. At which point the trailer is too light for the load?

    Thanks
     
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  3. Oxbow

    Oxbow Road Train Member

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    Usually the weight rating is for a concentrated load in 10' or 12' spacing. Your trailer will probably handle more for equipment. As to the laws in Alberta I can't help.
     
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  4. JohnIC

    JohnIC Bobtail Member

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    Good to know, I'll reach out to manufacturer for concentrated load per span specs. Trailer is 1993 Witzco RG-50 (55ton=120k lbs), which is equivalent to RG-60 model offered as of today on witzco website.
    As for local laws, there is no questions.
     
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  5. Razororange

    Razororange Road Train Member

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    Looking at their website they rate all of the RG series trailers for the rated load in a 16' span. Considering they are a US based manufacturer and always have been they are not using metric tons for their ratings. Their 50 ton trailer is almost certainly going to be rated for 50T(100,000 lbs) in a 16' span.

    You are mixing the US Short ton (1Ton = 2,000 lbs) with the Metric Long Ton (1Ton = 1,000KG = 2,200 lbs). 50 US Tons is about 43.3 Metric Tons. That's pretty much what you came up with for possible payload with your configuration.

    All of the weights you provided are in metric tons but the trailer rating is marked in US tons.
     
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  6. JohnIC

    JohnIC Bobtail Member

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    I must have missed this 16' span rating on their website, thanks for that.
    The reason I used all metric calcs is because our systems and permits are in metric. The tag on my trailer is in kg (55,400), hence another reason for metric.
    Whatever systems we use for figuring out the weight rating of cargo is ok and I wasn't aware of the difference between US ton and metric ton. Good to know
    Now that we know the 120,000 lbs is per 16' span, do I extrapolate to come up with rating on 22' span (which is the well)?
     
    cke Thanks this.
  7. Rontonio

    Rontonio Road Train Member

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    that trailer is not going to accept a tandem jeep or a tandem booster most likely. The neck will be too short and the rear attachement for the booster will not be reinforced for a tandem booster. You may be able to run a single axle booster or a closed quad ( not legal AB).

    without seeing the trailer, you may not have a long enough neck to even load the steer axle on your tri-drive - If it is a 120” swing clearance you probably won’t get more then 15k up front.

    on GVW it will be 55 ton including the empty weight of the trailer - so if the trailer weighs 22k - 98k would be max legal weight without
    “overloading”.
     
  8. Rontonio

    Rontonio Road Train Member

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    So if the tag says 55400 kg gvw that is 122,136 lbs. so 122,136 - minus take weight trailer = net load capacity

    This is why they are referring to in their nomenclature as a 50 ton.
     
    cke Thanks this.
  9. JohnIC

    JohnIC Bobtail Member

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    Thanks for clarification, appreciate it! Looks like max I can load on the trailer is 45 ton give or take. Which means in my case summer/winter I won't even need jeeps or booster. Yes, you are right on loading the front. To solve this issue I am looking at adding neck extension to get 120".
     
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  10. Rontonio

    Rontonio Road Train Member

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    before you spend money building a flip neck - you should get in touch with Witzco and run it past them. Even a short neck extension produces a giant increase in stress on the neck. Just look at the difference in the neck for a 50 ton trailer and a 60 ton or larger.

    since you said you are in Alberta - take trip to Accusteel near Edmonton and have them take a look

    so if you go 15k on steer plus max trident at 60.600(27500 kg) - that is 136200 lbs

    tridrive maybe 25000 lbs plus 22000 lbs trailer = 47000 lbs tare weight

    Net 89,200 lbs

    machine 42 metric tons = 92,594 lbs

    you may not be able to scale that machine unless you equipment is much lighter than that 47 000 I guessed.

    hope this helps you in your actual calculations.
     
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  11. old iron

    old iron Road Train Member

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    Every trailer I've ever been around XXX ton means XXX ton on the deck. In whatever footprint it's rated at. Subtracting empty weight makes no sense.
    Adding neck or boosters yah. Rating shrinks rapidly.
     
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