Advice on axle weights

I'm not familiar with Wisconsin overweight laws, but you need to provide more information.

100k gross or 100k load?

How many trailer axles, 3, 4, spreader bar? And how long is the trailer? How long is the neck?

 

So your gross is probably going to be 145 to 150 with a heavy spec tractor. By the sound of it you have a standard neck trailer. With a tag axle I doubt you can get much over 12 k on the steer.

I think you are pushing the limit of what you can permit at that weight with only a 3 axle trailer, but I don't run Wisconsin so I'm not sure.

Maybe @IH Truck Guy can help.

 

4 axle truck with an 18k front axle. You won't get 12k additional to the rears, bridge laws apply.

 

You won't get that weight on the steer with a short neck trailer.

 

Good luck.
You need a long neck to get 20k on the steer axle.

 

If you can't get more than 14k on the steer why do you want a 20k axle? You will be running expensive 425s, that don't last as long and don't drive well in the rain or snow. With a 14.6 front you can run 315s, or even 16 ply 24.5s.

Now if your trailer is set up for a flip box on the neck it might make sense, but I think you will find it much better to add a pin on fourth for the trailer.