I work at Oshkosh Defense. What I assume you are looking for is a M977A2 or M985A2 without the rear crane powered by the old Detroit Diesel 8V92 twin-turbo?Get to know the guys as OshKosh heavy industries, that is their baby.
HEMTT's are great but they are mostly convoy vehicles, not meant to go far off-road. They run straight axles and leaf springs with the A2 models and lack sufficient ground clearance for their weight.
The new HEMTT's are being fitted with CAT C15 (500hp) powerplants and they now have air bagged suspensions for driver comfort. Still convoy trucks the new A4 models. The remans come in and we re-build them to A4 levels likewise.
The next generation will have independent suspensions under them as evident with the new PLS-A1 that runs IFS on the front 2 axles while the back three are still straight axle.
The U.S. Marines that actually have an off-road profile on their medium and heavy tactical trucks run fully independent coil sprung suspensions with their MTVR and the LVSR with all 5 axles!
Straight axles are becoming a thing of the past with military trucks, more and more are becoming independent. The HEMTT is a great workhorse and having 8x8 capabilities is a plus but running with no load in the back is dangerous in rain or snow conditions on the roads. The HEMTT is a fine medium tactical truck but it can get stuck easily with its lack of proper ground clearance for its massive weight.