Nah I didn't level up my traders at all apart from Peacekeeper level 2. Didn't play that much, need to complete quests to progress and level up (currently im level 12 or 13).
I did the first quest for Prapor, the one with scavs and shotguns. On second now, with the key and truck thing, watched a video, just gotta do it.
Medicine lady quest, still gotta find 3 more salewa kits.
Skier quest, didn't start yet, but I do have a Kiver helmet in stash, just need some luck to find fort armor.
Peacekeeper, gotta reach lvl 16 or 18 or something, money requirement is fulfilled.
I didn't bother even looking at quests until I was level 11 or so. Leveling has been somewhat slow as I did a lot of low budget runs, either pistol or just hatchet. Great for money, not good for XP. I do have a decent stash right now though, considering my level: 500k+ rubles, 6k$, some €, one AKM and one kitted out AK-74N in stash that I got from two geared guys I dropped in Factory.
But yeah, really gotta level up my traders now. Peacekeeper 2 is only smgs, I did a silenced MPX factory run, got blasted by the first guy in armor because he just ate up all my bullets. I didn't go for legs because my previous shooter instincts make my aim jump to head/body. Until I level up traders I guess I'll use up my stashed ARs and go for a few SKS runs. Didn't really like the AKS that much.