Advantages of third axle placement

A master coil is straight from the mill. It goes to a smaller facility which either stamps the parts out of the coil or buy and resale to the end user. This will give you a little more of the lingo
Coil Processing - Metal Forming ABCs - Formtek | Metal Forming and Fabricating

 

The 3 9 's as they call them can run a 120000 permit here in ohio I think haulin steel. The tri axles are allowed if I remember correctly 48000 it might be 46000 on a tri as long as they are still only grossing 80000. Or permit for the 120000 steel permit LIKE THE 9's.

 

You got me fooled... I figured the master coil was that big one that Xheavy has experience with... The one that's 40 foot long that needed 30 chains... No?

 

That’s a super duper master coil. Only the most specialist drivers get to haul those.

 

The ones you see in northern Indiana are set up for Mi. Here we can load a 9' or greater speed at 18000 lbs per axle if gross is over 80000.

 

This is right on the money. 4 axle trailer at least 9' ( 48' trailer they put them at 10')
120 in Ohio with permit and back 3 on ground rolling to distribute the weight and stop it. Then when you get to Michigan all 4 down and rolling is good for 12-34-18-18-18-18 no permit needed.
I don't know what they are allowed in Indiana.

 

We always ran 4 9s. Fixed ones in back were always on 9' spring walking beam. Had a couple 48's set up that way.

 

Up here in AK, we are allowed 40 on a spread, 38 on a closed tandem, closed 3 axle setup is only 42, so really no gain over a spread, but a belly axle is worth another 15 with single tires, so it is a pretty good advantage. But there is another and more important advantage and that is having it and just using it to get past the scales in the winter. Winter our weight limit goes up to 42 on the tractor tandems, but we have to take that 4 thousand off the trailer, if we have a full load and raise the belly axle it is easy to get another 6 thousand or more on the tractor, so you don't have to chain near as much.

 

I should add lots of the trailers will have the belly axle closer to the landing gear that to the spread, and many of them have two belly axles, still spread., A lot of the tankers will have a tridem, and 2 belly axles, pretty easy to get 56 thousand or so on your drives with that setup.