The Marauder buggy is a vehicle in Jak 3. It is the most common vehicle used by the Marauders; used to scout the desert for valuable Precursor artifacts, as well as piratical wolf pack raids on lone wastelanders. They have also been used in suicidal kamikaze attacks on Spargus' walls.
They have a rotating cannon mounted on top of the vehicle. Not much is known about the ammo it use but it is known that it has a good range and accuracy. The passenger area is open so it would make a driver vulnerable. They are best fought in a buggy; the Sand Shark, Desert Screamer, Heat Seeker, and Slam Dozer are particularly effective. It's recommended not to try fighting them on foot, unless you have obtained the Peace Maker (which can destroy a buggy in one hit) or the Plasmite RPG (which has the same power and range as the Dune Hoppers lob cannon).
During the mission "Defend Spargus' front gate" you will encounter burning marauder buggies, indicated by a bright orange blip on the mini-map. They will drive around a bit like normal buggies but soon will plunge into Spargus' gate, killing themselves, while attempting to crack it open.
During the "Take out Marauder Stronghold" mission you encounter special marauder buggies with a blue-ish body tint. During the ambush where Jak fights a bunch of Marauders they eventually flee, forcing you to hunt them down. The last one was carrying a Prism, which Jak needed for the Astro-Viewer.