Compared with the Unimog 425, the 435 has a longer wheelbase and more powerful engines.

[2] Like other Unimogs it has a ladder frame, portal axles and coil springs.

Depending on the built in gear box and portal axle final drive ratio the top speed is between 80 and 100 km/h (50 and 62 mph).

A compressed air trailer brake system was an additional accessory.

In total, 473 units of the 435.115 type were built as RW1 fire engines (as depicted in the infobox).