The Maxxpro MRAP is an armored fighting vehicle designed to protect it's passengers from mines and IEDs. It's V-shaped hull deflects the blast of a land mine or improvised explosive device (IED) away from the vehicle to protect its occupants.

If you want a roof mounted machine gun just add "machine gun" to your prompt. You can try to open the doors with "doors open" but it might produce odd results.