Kenworth W900 Steering Hard

We have a 2005 Kenworth W900 that has a Spicer E1322I 13,200 lb front axle and are wanting to put dual steering gearboxes on it and our Kenworth dealer has been in contact with Paccar and they say its not possible. The reason is for hard steering. We have changed the steering gear box and also the pump and don't seem to change any.

Does anybody know of this axle that has dual steering gearboxes?

Is there anything else we could do to make it steer easier?

Kenworth W900 Steering Hard