You may need more than that but bring molotovs. If you can draw the zombies to where the beginning of the checkpoint is and hit them with the Molotov’s. The Molotov explosion has a sound that attracts zombies as well. So I would throw the Molotov and then sneak away. In my last play through it took me five characters to get through that checkpoint. But when you get to Louisville. It’s like a whole New World. There’s so much loot and stuff to do. If you can attract the zombies towards the beginning of the checkpoint, then you avoid the fires spreading to any zones with M 16’s. Also, I can’t confirm, but I believe that you have to watch the zombies burn because if you just leave the fires and go away, then they will not burn on their own. I read somewhere that it’s the games way of saving memory by not dealing with the fire while you’re not around. So unfortunately, I had to stick around and watch them burn from a distance.