Help a newbie with load placement

I just bought a 53' step deck with spread axles. Actually it was originally a 48' but then a 5' dovetail was added so the axles may be farther forward than they would be on a 53'

I went and weighed it empty today full of fuel and with headache rack and all chains, binders, etc.

It was:
9,560 steer
12,080 drive
10,400 trailer
32,040 gross

Primarily I am going to be hauling my own equipment to job sites.

I have 4,000lb of stuff that has to ride on the upper deck and then I have a 15' long machine that weighs 20k, and a 22' long machine that weighs 10k.

I am sure it would scale legal either way because it isn't that heavy but should I place the 15' 20k machine in front or behind the 22' 10k machine?

 

Thanks guys.

The heavier machine is actually perfectly balanced. It has a big hammer in the middle of it that beats on the ground and they engineered it so that the center of gravity is right in the middle of it.

The longer one I have no idea how it is balanced but it is only 10k so it shouldn't make a huge difference either way.

I was just a little concerned that it might be too much on the truck with the 4K sitting essentially right on top of the kingpin and the 20k machine in the first 15' of the trailer.

On a tandem you typically measure the center point of your trailer from the kingpin to the center of the tandems on a spread do you just measure between the midpoint of the spread and the kingpin? Not really relevant to this load but was wondering for other things I might haul. I am assuming if you just are hauling one thing (like maybe this 20k machine by itself) that you want it centered over the trailer midpoint?

 

I measured from the kingpin to the center of the spread and it is 38'3.5"

Now to get out the calculator......

 

The dovetail is super stout. It was made by TMI in Lubbock. They take 48' steps, rip the floor out, sandblast the trailer, put new apitong floor, build the dove and ramps, rewire, go through the brakes and axles, etc. They told me guys have loaded 50,000b excavators on their dovetails with no problems. My heaviest machine is 20k and is on rubber tracks.