As I mentioned, I am familiar with the PLS, but only drove the four-axle LHS (and HEMTT).
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HEMTT variants are fitted with power-assisted front tandem steering systems
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Oshkosh HEMTT Heavy Expanded Mobility Tactical Truck - Army Technology
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The front tandem provides steering. The rear tandem is nonsteering
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http://tfsweb.tamu.edu/uploadedFiles...%20Vol%201.pdf
[M977 SERIES 8 x 8 HEAVY EXPANDED MOBILITY TACTICAL TRUCKS (HEMTT) TECHNICAL MANUAL]