How would you like to earn currency?
Earning money should be somewhat difficult and rewarding. There can be varying levels of earning money from killing bots to completing a compound event or raiding contaminated zones.
What items would you like to see from traders?
Meds: Gauze, and bandages
Ammo: Different types of ammo depending on trader level (see bellow)
Weapons: Same as above different level trader decides level of weapon.
What is your vision for how traders would work?
I think that there should me multiple different levels of traders ranging from a trader that sells basic low level items to a trader that sells high level items like t3 turret parts or high level weapons. You can sell them resources that you have to many of. You can trade in 100 9mm rounds for 20 .223 ammo. If you trade in 10 gauze you can get one bandage. Different items would have different values that you can trade for.
Where would traders be located?
I think that there should be one trader that is permanently at a safe settlement. This would be a low level trader because there is almost no risk going here. There should be 2 stationary traders located around the map that has a small SZ located around them to prevent players camping the trader all day. Final there should be a roaming trader that has a changing inventory that has very high end weapons and tools. This trader would not spawn with a SZ located around them and there would be a risk going to them.
The wandering trader would not have a shifting inventory but will run out of high tier items until it appears after appears twice with no inventory.
I took some ideas from @BlackLightJedi so thanks to him for some of the ideas.