How can I get more weight on my truck?

Theoratically as long your load is no higher than 13.4 or so anywhere on the entire rig you will get what you get.

I think what you are running into is the material your load is made of. For example. If you loaded that full of Balsa Wood which are used in models etc it's going to be very light and you will stack it as high as you can go and it will still be light. You will cube out before you weight out.

Now if you stacked say Oak on there, you will get to 80K pretty fast before you managed to volume out.

You have a steel trailer. You would be able to load more freight with a aluminum one but considering the load you have on... 75K something gross is not that bad. It's a nice weight. A little heavy on the spread back there. But routine.

Im betting those spreads are helping you nicely. I don't think you can reverse the pattern of that load on that trailer and still be able to scale less than 34K on your drives. So it's good.

 

Is your spread at the rear or do you have deck behind the axles?

 

How high is your 5th wheel? In a perfect world the bottom frame rail of your trailer should be parallel to the ground. If it has a belly in the frame measure from the frame just in front of the suspension mounts where they are welded to the frame. Those heights should be close to the same. Measure that on both axles.

 

What he said. If your axles are set forward like most new 53' steps you should avoid loading anything heavy behind the spread. It acts like a lever taking weight off of the drives and transferring it to the spread axles.

I always try to load steps in between the step and the front trailer axle. If I have to go past the front trailer axle something should also be on the top deck. This works with uniform loads.

 

Yes it looks reasonable for height. How long is the upper deck? I've only pulled stepdecks here and there over the years but l remember not being able to run my 5th wheel where l usually do when pulling a step. I have a long hood Pete also and l run my 5th wheel well ahead of centre. Probably 6" or so. All the trailers l pull usually have 18-24" kingpins so its not an issue with a normal flatbed. It looks like you would rip off your fender brackets doing that. You might have to live with it and just load everything forward a foot or two ahead of centre when possible. On a load of lumber like that you might be out of luck getting it balanced nicely.

 

Put more on the front of the bottom deck right behind the step next time.