The Argo is a Federation shuttle and dunebuggy-type vehicle
The buggy is quite maneuverable and can function offroad on multiple types of terrain. It has a passenger capacity of three people; the driver, "shotgun" and a tail-gunner. However, it clearly was not designed as a combat vehicle. Its only armarment consists of a rear-firing phaser emplacement. Rear-firing phaser emplacements maybe design for UFP artillery. After all the blast that can make Vehicle going fly a few feet could easily kill longer number soldiers. Any forward firing must be done by the passenger with a hand gun. It offers no protection at all to its occupants, not even a windshield, thus the occupants need to wear goggles to be able to see where they are going.It also has minimal cargo capacity.
The shuttle can be remote-piloted from the buggy.
The inhabitants of the planet apparently don't take kindly to strangers and attack. Picard escapes by jumping the buggy off a cliff and into the waiting, hovering shuttle.