The HMMET Sits way too low on it's front wheels.
Wheels are touching body w/o load in vehicles
Normal wheel clearance should be much taller and at the very least presenting more clearance on the front wheels.

Front wheels are almost touching body/frame.
Image
http://impulse9.unitedoperations.net/misc/a3/a3_169_hmmet_wheel_clearance_1.png
http://impulse9.unitedoperations.net/misc/a3/a3_169_hmmet_wheel_clearance_2.png

Second Image shows unsupported weight of vehicle giving a mostly normalized clearance height.

Turn Radius on vehicle is very small, and wheels clip though body of unit.