This is a glitch on Outpost that you can get into on Survival that will help you get High on the Leaderboards. Not sure on who found the glitch but thanks! =)
I almost facepalmed myself for a moment there, I thought this was going to be inside the truck like the 100s of other videos but I was pleasantly suprised to see a good glitch on this game mode and map, thanks Dope.