Hi Pelletman.
Yes that model of Toyota is equipped with Cushion tires.
It is not possible to convert to a Pneumatic, as the cushions use a press-on hub, where as the pneumatic will need a multi piece or 2 piece wheel.
Additionally there is a significant difference in wheel diameter and overall tire diameter, which will not allow for a conversion.
Also consider, any such changes need the approval of the lift manufacturer, as the data plate would need changing.

Can I ask why you would want to go to a pneumatic? There might be another way to address the issues your having.