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I've added it to both the trader and the items.xml with no luck:

trader.xml:

<configs>
    <append xpath="/traders/trader_item_groups/trader_item_group[@name='groupMeleeAll']">
        <item name="meleeWpnSledgeT3SteelThorHammer" quality="2,4"/>
        <item name="meleeWpnPolearm" quality="2,4"/>
        <item name="meleeWpnVampireGauntlets" quality="2,4"/>
    </append>

    <append xpath="/traders/trader_item_groups/trader_item_group[@name='groupRangedAll']">
        <item name="gunRifleT3DCLXVIZeus" quality="3,4"/>
        <item name="gunRifleT1HuntingRifleSavery" quality="3,4"/>
        <item name="gunKronosXII" quality="3,4"/>
        <item name="gunPP-19Bizon" quality="3,4"/>
        <item name="gunNewcomen" quality="3,4"/>
        <item name="gunBowT3BlackWidow" quality="3,4"/>
        <item name="gunShotgunQuadrupleBarrel" quality="3,4"/>
        <item name="gunRifleT3DCLXVIZeusAmmo" quality="3,4"/>
    </append>
    
    <append xpath="/traders/trader_item_groups/trader_item_group[@name='rareTools']">
        <item name="meleeToolAxeT3Brainsaw" quality="3,4"/>
    </append>
    
    <append xpath="/traders/trader_item_groups/trader_item_group[@name='ammoArrowsBolts']">
        <item name="ammoRedWidow" count="20,60"/>
        <item name="ammoBlueWidow" count="20,60"/>
    </append>
    
    <append xpath="/traders/trader_item_groups/trader_item_group[@name='ammoAll']">
        <item name="gunRifleT3DCLXVIZeusAmmo" count="40,150"/>
    </append>

</configs>

All items or mods were given this line:

<property name="TraderStageTemplate" value="baseTier3"/>
			<property name="TraderStageTemplate" value="modsTier3"/>

Am I missing something?