Heavy Haul Miscellaneous Thoughts, Ideas and Questions

Discussion in 'Heavy Haul Trucking Forum' started by Oscar the KW, Feb 8, 2015.

  1. johndeere4020

    johndeere4020 Road Train Member

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    Well that makes a little more sense, I've seen trucks with the cheaters father forward but wasn't sure why. So to scale the max you need a certain amount of external bridge as well as internal bridge? We don't do stuff like that out here.
     
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  3. cnsper

    cnsper Road Train Member

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    Probably just not enforced. At 105,500 with 8 axles you need 69' from steer axle to last trailer axle. If you subtract 12k from that it leaves you with 93,500 that you need to bridge with the remaining 7 axles and here at least that means 57' between the drop on the truck and the rear trailer axle. Very hard for that to happen with a deep king pin setting and a short truck. We have one trailer that I can use and bridge that but it only has like a 10" kingpin? All I know is that 1/3 of the fifth wheel plate stick out from the front of the trailer.

    This is what gets most people here is the inner bridge. We have one MCS officer that is VERY good at judging distances. I got him by 3 feet once..... LOL I was 107 feet long and you don't need pilots until you get to 110.

    It is very hard to get the length for the bridge and weight on the steer all at the same time. So most of the time you will see these trucks only running 100-103k gross, unless they don't realize that about the inner bridge lengths. Most people count the axle groups only and think that is good.
     
  4. glitterglue

    glitterglue Light Load Member

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    @cnsper, I understand that it is hard to get the steer weights and length correct, however, I want to clarify the lengths you noted for bridging 105,500 (making sure I'm understanding what you're saying):
    -- Outer bridge must be 69'
    -- With 12 on the steer, that leaves 93,500 for inner bridge
    I agree completely with these two.

    Per the Oregon Extended Weight tables (table 2), 93,500 must have an inner bridge of 60' -- since 59' allows for 93 and 60' allows 94k. The 57' you mention above only allows for an inner bridge of 91k - am I correctly surmising that that is where the 100-103k gross #'s come into play??

    So, in reality, the minimum outer bridge, for 105,500 would be 72', no? - This is with 12k on the steers.

    To get 69', you'd have to manage 15k on the steers.
     
  5. cnsper

    cnsper Road Train Member

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    @glitterglue I am going off of the Montana tables and I also have 8 axles on the ground counting the steer. On 7 axles I can scale a gross of 93,250 on a 57 foot spread. Where the 100 to 103k comes in is with the trocks that cannot achieve that inner bridge because the truck is too short or the kingpin is too deep.

    With 8 axles on my chart 69 feet is what you need to scale 105,420. Close enough for me. The Oregon chart may be different. I would have to look but the chart for Montana follows the federal chart.
     
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  6. glitterglue

    glitterglue Light Load Member

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    Okay, that makes more sense.

    On the Oregon charts -
    With 7 axles, 57 feet, Oregon only allows 91,000
    With 8 axles, 69 feet, Oregon allows 105,500

    Wish Oregon would get it together and be more like the other NW states.....
     
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  7. Oscar the KW

    Oscar the KW Going Tarpless

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    Iowa you can gross 86,000 as well, KS IIRC you can go to 85,500. I know that there are more, but can't think of them off the top of my head. You have to register the extra weight on your cab card also.
     
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  8. johndeere4020

    johndeere4020 Road Train Member

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    I know when I lived in KS we were tagged for 85,500 and we pulled tri axle hoppers, in a single dual single configuration. I swear we couldn't do that in the interstate but I was told you could.
     
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  9. Oxbow

    Oxbow Road Train Member

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    Seems like Iowa you have to stay off of the Interstate over 80K, unless it is a permit load.
    I had a T600, about a 240" wheel base, and 48' spread axle trailer with the axles clear to the back, and I could license 86K but could only bridge a bit over 84k. That was back in the 90's though.
     
  10. Oscar the KW

    Oscar the KW Going Tarpless

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    Yeah in Iowa you are not allowed to be on the interstate over 80,000. But when I pulled a livestock trailer there it didn't keep me off the big road.
     
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  11. cnsper

    cnsper Road Train Member

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    You were a REBEL. Probably had a confederate flag on the grill too?:p
     
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