BikeDriver is partly right, but i don't think finding the vehicles is such a problem, because there's always one player that played here for years and knows where all the monstertrucks are
btw Dominik you said it's 8 teams, but you only listed 7 teams ^^.
There are at least 10 Monsters, so that shouldn't be a problem.
Do it.
btw: I'd suggest to activate the shooter's weapons just some seconds after the start, otherwise they'll kill each other on the first mile.