Observed:
A Hunter can come to a full stop within ~35 m from a speed of 100 km/h (flat dirt road).

Expected:
Vehicles should have more inertia and tires should have reduced slide resistance. The observed braking distance seems very unrealistic for a 10 ton military vehicle.
For comparison, a Porsche Carrera 4S, equipped with high performance ceramic brakes, comes to a full stop in 34 m, in perfect conditions (dry & clean asphalt road).

Also, the surface does not seem to make any difference on the braking distance. Vehicles should have reduced traction on dirt roads and on wet surfaces. When performing high speed maneuvers on loose surface roads, it should be more difficult to control the vehicle.