the higher the rank the worse off you will be rank 16 is the best if your rank 10 and up you will find this hard to do
as a trapper first thing you want to is to make sure you can get the traps quickly set up on commonly used pallets and jumps narrow hallways as well... but dont just start collecting and forget about the survivors... try your damnest to kill them. you may need to use dirty tactics as well. (camping and tunneling) by the time they get to the 1 kill you will know if you can complete it, once your at 2 kills go for broke slam the last two kills as fast as possible... you may need to camp. when it comes to one person you need to find the hatch first otherwise this will be a failure quickly... it may take several attempts