Extreme is an understatement. The 4900 SA is available in two different BBCs for military applications.

Specifications
BBC	109", 123"
Axle Position	50"
Engine	3 manufacturers, 210-600 HP
Transmissions	Full range of manual, automated, and automatics
Front Axle Range	Up to 20,000 lbs.
Rear Axle Range	Up to 58,000 lbs.
Sleeper	48"
Special Options	Front driving axle on the 109" version