There have been several models since the S 404. See Unimog Models for more information. The Many Flavors of S 404 S 404 Unimogs come with varying engines, cabs, cargo types, factory installed options, and engine-driven implements. Common variants are listed here. Soft or hard top.
Some hard tops have a passenger-side roof hatch.
For the latter, US readers should try to picture an army's idea of a mid-size Ryder rental truck. This list is not complete. This series comes with either a Mercedes 2.2 or 2.8l gasoline engine, with a 2.4 liter diesel being a rare variant. The 404 came with engines capable of up to 110hp. Higher horsepower is possible by modifying the engine or swapping it with a more powerful one from a Mercedes automobile.