What six  items do you consider best for barter, it will vary as to area for sure. Remember you need to keep enough for your 'self'. Be that a group or just you and 'yours'. Some things are finite, others are 'renewable' or replaceable. All things will have pluses and minuses. AOH, very tradable, downside is the drunks, is also fuel and has uses for medical. What about skills/knowledge? Ammo, seeds, food, water, fuel ect. Some things are cheap now, easy to stock up on, later could be very valuable, hmmm what could that be? Hopefully this will have ya'all thinking and not just a quick answer, like I usually do. Put some thought in this, I have and am doing so.