Math formula for load placement

Just to try another example.
Lets say I need to load a divisible load of steel plate.
Needs to go on the bottom deck.
The catch is I need the rear trailer axle lifted for state kingpin length regs.
[ Real close to a Cali legal 53' Tandem]
Load weight is 46,000# What is the maximum length of plate I can load before the trailer tandem goes over 34,000# ?

Guessing if the 3rd trailer axle weighs around 1,000# and is now hanging in the air 9' behind the new trailer group center it will pull an additional 250# off the drives and add it to the trailer tandem.

Using the "Heavy Hammer" formula I know that 46,000# balanced 20' behind the kingpin will put 24,250# on the rear. + 9750# trailer empty weight = 34000#

20' behind the kingpin - 9' top deck = 11' x 2 = 22'
If this is close to being correct 22' long 46,000# plate is the max I could load on the bottom deck if it is loaded tight against the front of the drop.

But as a 12' spread tridem with 41' kp to center.
[Legal federal bridge of 45,000# on the group.]
46,000# balanced 31.6' from the kingpin, will put 35,500# on the tridem + 9500# trailer empty weight =45,000#
31.6'- 9' top deck = 22.6' x 2 = 45.2'
In theory you could load 45.2' long 46,000# plate and not be over 45,000 on the tridem.
[Would be hanging off the rear off the trailer 3.2'.]

Thinking the equation must change after the load goes past the rear trailer center group. It will pull additional weight off the front?

 

Every fall Wi gives us farm guys 15% over for field to farm, or field to market.
That is 15% over your legal axle limit.
Not 92,000# gross like everybody around here thinks.
Most grain trailers I have seen the weight rating is 65,000#. They pull em behind a short day cab with a 12k steer and low pro 22.5s.
92,000# gross is a pipe dream.
My rig I cant legally get over 88,000#.

Good friend of mine had his brother hauling for him this fall.
Got pulled over for speeding. The portables got brought out. He only weighed 89,000# so he was good. But made the mistake of admitting he had loaded out of a grain bin and not a field. The overweight fine started from 80,000#.......

 

Not 100% sure on the weight yet. Bought the trailer in eastern Ontario and am waiting for the Export Broker to get his end finished before I head out to get it.

Trailer is a twin to this one.
Should come in close to 12,500# bare bone empty.
If I keep just what I need in the truck and play the "100 gal fuel game", I should be awful close to 32,000# empty.

Trailer is rated 120,000# Evenly distributed.
70,000# in 10.' And 60,000# in 4'

I know an aluminum trailer with an aluminum deck is far from a good idea in the equipment hauling world.
No D7s with ice picks for me.

Most likely I will still haul 90% of the flatbed freight I have in the past. And will now be legal in western Canada with out messing with a slider.

What I tend to do is bid a very high rate on loads going to the dead zones that no one else around here wants to end up in. Mt, Wy, Id, Western Dakotas.
Ran a lot of N. Ontario last summer for round trip $ on the outbound side.
Wanting to try the same thing in western Canada.

The scenario I'm wanting to try is taking a normal flatbed load of hi-grade walnut lumber. 4' tall and 48'
Double stacking to 8' tall and 24' and loading tight against the step. Drives calculate right on 34K.
Would leave me 18' on the tail and 11,000# to play with on Interstate route for a partial as soon as I get out of Mn.
N. Dakota 2 lanes heading to Canada 18' and 14,000#.

 

Had to run and didn't finish my rambling thoughts.
My immediate area drop deck freight going outbound is pretty slim, or at least I haven't found it yet. Mainly flatbed raw materials.
But the inbound side is a different story.
My thinking is if I'm emptied out in B F Nowhere with a 400 mile bounce already priced in that gives me lots of options on getting home with this trailer.
The possibility to haul a bit on the specialized side could pay off pretty well in the right place and right time.

Even if the trailer comes in a ton heavier it shouldn't affect me to much.

Not planning on driving anything with major axle weight on or off. But I don't see why I couldn't crane load a piece up to 76,000# with enough length that the trailer can take it structurally. As long as it will balance on the bottom deck.
Clint Eastwood said it best.
''A mans got to know his limitations''
Just trying to find it for my rig.