[kyleb]

I haven't noticed my tag tires skidding - except on really hard panic stops -- which are rare.

The air bags on the tag are much smaller than the drive bags. The tag drums are the same as the steer axle. The tag brake chambers are smaller than the drive axle chambers.

I went to a QT that has a certified scale & had it weighed, was cheap & their scale would weigh all 3 axles individually.
Front axle - 12k
Drive axle - 20k
Tag axle - 5k
I don't remember the tag pressure. . . .

I would suggest increasing tag axle pressure until you get 12,000 to 12,500 lbs on the steer. That will give you maximum traction & stability.