Apparently not. It still uses the same air suspension that was on the original PLS. I found this on the Oshkosh PLS page.
“All PLS variants have the same rear tridem unit which consists of a single Hendrickson-Turner air-sprung drive axle (3rd axle) and a Hendrickson RT-400 leaf-sprung AxleTech tandem (4th and 5th axles) on which the rearmost axle contra-steers. On PLS A1 variants the front AxleTech/Oshkosh axles are sprung using Oshkosh’s TAK-4 fully independent coil spring suspension. The original PLS had a Hendrickson RT-400 leaf-sprung tandem front suspension.”