It's all about the distance between the steer axle and the back axle on the trailer. Keep in mind that unless you have a spread you'll still have to get the axles correct
Help on bridge law formula for semi dump
Discussion in 'Tanker, Bulk and Dump Trucking Forum' started by T-800, Aug 24, 2018.
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You MUST take into consideration the inner bridge which is axle 2 to axle 5 or axle 2 to axle 6 if you have a tri-axle.
NightWind Thanks this. -
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Afaik the inner bridge is from the rear drive axle to the first fixed axle on the trailer not the rearmost axle.
NightWind Thanks this. -
So I will need a 40’ then. Dang
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By federal bridge law you need 51feet center of axle 1 to center of axle 5 for 80,000 lbs. Then you also need at least 36 feet from axle 2 to axle 5 to carry 68,000 lbs. 12+34+34. If you can legally carry more than 12,000 on your steer axle you might be able to shorten up the 36 feet between axle 2 and 5.
Hope this helps -
Well if that’s the case I’m curious to know what the length on a 36’ would be. I wonder if I could get away with a few inches short
Edit* I mean what the king pin to rear axle is.Last edited: Aug 25, 2018
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With the trailer axles though trying to max the steer axle out should become a non-issue. You’ll just have to get used to running slightly tail heavy.
I’ve seen dump trailers consisting of a shorter bucket mounted on a longer chassis. Something like that might be what you’re looking for.Last edited: Aug 26, 2018
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Last edited: Aug 25, 2018
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