Straightforward Frontline build using shotguns, you can just hug a breaker while unloading your boomstick at his face and end up hp positive thanks to true grit and temp hp from shotgun bruiser.
Honestly any character works, imo walker, mom and karlee are the best for this one.
Ammo stash is there because shotguns can devour your ammunition super quick, get a tec9 or Belgian and start blasting.
You can replace fleet of foot for run like hell if you want, I don't like using run like hell unless I'm running an Ads build, the accuracy debuff can be annoying.