Another thing lil glitch i found is balistic knife gersh combo(probably well known). wait till you see the double points and throw a gersh. 260 for every kill that goes in it. Do this chilling on the truck by phd with an automatic. upgrade the balistic knife and get the sickle so you can knife from the glitch and revive teammates near the launcher. simple, easy, top the leaderboards. I was number 25 on highscore before the leaderboards **** it up.
+ if u have another friend with you on the truck he can flap the hoard of zombies from a higher barrier on the truck.

thanks anyone