How to load a Tridem Grain Trailer (spring ride)properly

I found it to be just like the first two comments, tarp open and fill from the top ... oh and make sure all three slides are closed ( it fills faster that way ) .

Now going beyond the smart A$$ comments as it was too hard to resist, we used to have a unit very similar to that as ours had the 74" sides and a 1996 model with the three hopper out the back Lode King. Because of tractor weight and so forth its impossible to give an exact explanation but will give you a ballpark to start from.

Wheat, first one pile to the top of the trailer at the front of the front hopper, then go to the rear hopper and fill completely, then back up and fill at the very back of the center hopper. That seemed to get enough weight on the drivers as its was very easy to overload the front by getting carried away.

Canola, two heaps in the front hopper so only a bit of room left at the rear of the front hopper, then fill the rear hopper completely, then pile two heaps starting at the rear of the center hopper so you have some room left at the front of the center hopper.

As well you will have to play with your fifth wheel to get enough weight on the front but doubt that will be a problem with a T800 being the set back front axle. All you can do from my suggestions is weigh each axle set once its loaded, on a highway scale for instance and see how its balancing out and adjust in future loads from there. The tractor air gauge, I would be guessing to give a pressure but if you explain what style of air suspension it has ( Kenworth 8 bag for example ) then someone on here may have a good idea what you should be reading.

Here is a picture of the air dryer setup if that makes a difference

I was taking a peek at some used trucks lately and Kenworths being in the mix and some having the 8 bag system so I tried to find some info online ( obviously a truck shop or someone very familiar with them could give great insight ) and came across a few comments. It appears they made changes through the years and for a time they were a high maintenance troublesome costly system in one design phase. Unless I was misinformed it sounds like they went back to a more simpler system of parts and made out of materials that are not falling to pieces from corrosion like they were in that 200 series. But the one thing that came up which helped answer this question about why one person on here claimed horrible traction and another having really good luck compared to other systems, its the series of system and what upgrades they did or adding upgrades to older units.

The gist of it is that the older systems had small air lines running between the bags to equalize them so when going over uneven ground and so forth, they couldn't react quickly enough and an axle or corner would break traction where as with the larger lines the air can pass back and forth much easier to allow the system to follow the ground. So Born2Farm, I think that may answer why you are happy with how yours is working and someone with an older tractor is not a happy camper in less then ideal conditions. I don't know then if the 400 series came out with the larger lines off the start or what year things were revamped but that could be easily obtained at a dealer I would think.

As to the original poster, I never did come up with a ball park air pressure and would just be guessing to say around 70. If you are hauling wheat for instance off the start, just load like I mentioned and if you can get to a highway scale great, if not then if the elevator has a full length scale you can drive on slowly, stop but don't hold your tractor brakes ( if its level obviously ) to weigh the front, then front/drivers, then the whole truck and trailer and jot down each reading so you can figure out each axle grouping separately. Assuming you were wanting close to that 17000 kg on the drives, you would know if you are light or heavy there and what the steering looks like ... and of course the tri set. I guess if you get stopped you tell them like it is, its all totally new to you and you asked around to get an idea of how to load so as not to become overloaded. Maybe don't load it heaped between each hoop the first go with wheat though, that could be asking for it

What is the maximum weight you can put on a Tridem Grain Trailer on Sask Roads?
Some places online say 23,000kg and some say 24,000kg................?????
Here is one link I found that says 23,000kg
http://www.rmcormanpark.ca/media/tinymce_files/Technical_Services/Dont_Overload_the_Road.pdf
This these links say 24,000kg from April 10th 2014:
Saskatchewan Increases GVWs for B-trains, tridem tractors | North Star Fleet
Saskatchewan updates trucking regulations | Truck NewsTruck News

My inter axle spread is exactly 120 inches = 10 feet
Now, my trailer is a 1998 but I called Doepker's head office today and they told me that the new Tridem trailers also have a 120 inch spread.

Does anyone know what the official rule is?
TIA