Adjustments to 5th wheel

On a standard setup. 1 drop axle gives you 43.5k. 2 drops take you to 52.5k.

If you add the 2 axle groups. That gives you 87k. 96k.

Then you have the bridge. It measures center of front axle on front axle group to center of rear axle on rear axle group.
That length combined with number of axles gives you bridge weight. That number may be less then combined axles weight.

Oregon is even lower on bridge weight.

Those of us heavy haulers. Over 80k. Have to pay attention to both axle weights and bridge weights.