Monster Trucks was a game type from Halo 3 where up to 8 player would get in warthogs and attempt to knock each other off. In this version, players launch themselves onto the battle area from surrounding ramps and battle it out.
The map created is called "Ejection" and the gametype is "Battle Hogs." I have played numerous hours of this with my dorm mates and have had a blast and hope you do as well. You can find both of these on my fileshare.
Open "File Browser"
Select "Map Variants" or "Game Types"
Select "File Share Search" and type in my gamertag "The Prower"
Press "Y" and download map and/or gametypes.
Thanks again and let me know what you think.