Yes, they do exist in reality. But they are very specific modified for missions, so there seems not to be a common generic type.
The FAV (Fast Attack Vehicle) are similar to sandrail "cars".

Examples:

• none found yet

Similar vehicles:

• DPV: Desert Patrol Vehicles (appeared also in the movie "Three Kings")
• LSV: in real life there are also so called LSVs: Light Strike Vehicles, I don't know the exact definition differences between them for now.... working on it :)