Long dry grass is dangerous as it can set your vehicle alight.
Burnt out vehicle
The dry long grass between the tracks, especially in the Kalahari, can accumulate between cross members and exhaust brackets, or even wrap around the prop shaft. This grass can then be set alight by the heat of the exhaust pipe. Stop regularly to remove any grass build up. It may be difficult to reach the hot spot with a regular fire extinguisher.
I built my own grass extracting hook on an extendable rod, as well as a sprinkler nozzle of the end of a rigid irrigation pipe. This then is connected to a pump submerged into the water tank and left plugged in a lighter socket.