sentences:  Early units, with a Cat D333 engine, were multi-fuel, but later ones, with the D333C powerplant, were diesel only.Not only did the Caterpillar offer extreme off-road ability, including 20° longitudinal articulation and 30° side-slopes, it was also fully amphibious, using the wheels for propulsion in the water.The rear cargo-bed tailgate and drop-side doors, that allowed rapid discharge of cargo, had watertight seals to preserve the unit's swimming capability.