Advantages of third axle placement

Deleted. Wrong answer

 

They’re different trailers for different purposes. The ones with axle in the middle can run as a spread or a tri for different freight. The one with the axle in front meet different bridge laws.

That has nothing to do with it.

 

Closed tri’s are considered an axle group 60k is the most they are allowed in most states. If each is spaced at 10’2 they are considered separate axle groups. In a lot of states they are allowed up to 22 to 25k per. So they are allowed 66-75k.

 

You would be looking at what I would call a Tridem instead of a standard 10' spread.

For the small cost of a set of tires, the axle etc you can load a flat 60,000 back there on such a three axle set. At least in Arkansas. It would not turn very well.

 

It turns fine.

 

A typcial 10 ft spread can haul 40k legally. Throw in the 3rd tire in the middle and you've added 3500 lbs to the load. Minus the axle weight you're probably only gaining an extra 2,000 pounds.

Seems like a few people mentioned that the load has to be NON divisible to be able to haul 20,000 per axle

I haul liquid. Which is a divisible load. I can't go over 43,500 but my 3rd axle is also a drop and not a full axle with dual tires. Although dual tires could be installed on the drop.

As for having the drop spaced out in the front. That would extend the bridge and allow more weight on the axle group.

For instance. One guy just recently posted his trailer setup on this forum. He has 3 axles but he has what looks to be 2 feet between axles. He's not bunched up. Taking a wild guess and not knowing his bridge. He could probably haul 46,500 - 48,000 where as I can only haul 43,500

This is all figuratively speaking of course. You guys on the east coast have some funky bridge and weight laws compared to us on the west coast.

Should have posted this in the heavy haul section. Might get better answers from the guys that do it on a regular basis.

 

That is a rust belt steel hauler setup. The handful of states they run in allow permits for multiple coils and large master coils.

 

What’s a master coil? Just a big coil? Or is there something else about it?
I don’t haul coils now, nor have I ever.