The main objective of an off tank in trials is to support the group, and take over for main tank in emergencies. This allows us to get very creative with gear and skills.

I go 5-1-1 with off tanks, not sure if its the best to do, but works for me.

Traits - Full Sturdy for max block cost reduction, could run infused on big pieces (Head, Chest, Legs, Shield) with prismatic enchants.

Sets - Heres where we can get creative, sets that offer group utility like Alkosh, Lunar Bastion just by picking up synergies, Powerful Assault, procs off healing from vigor. Ebon armor, gives everyone extra health.

I run Lunar Bastion and Alkosh on my off tank and pickup synergies like a mad man, gives everyone a shield and fractures adds armor, Win/Win Feel free to think outside the box. If it buffs your group, its probably ok as a off tank.

Monster Sets - Again get creative, got alot of stam dps, use Rkugamz and use vigor, gives group health and stam. Lord Warden for melee DPS resistances, Bloodspawn for ulti regen and Engine Guardian for resources, however these two dont offer group support.

Food - Tri Stat food is a must for any tank.

Potions - I generally chug trash magic pots for the regen and to keep casting shields. In harder content you want Tri Stat Potions (Bugloss, Columbine, Dragonthorn)

Message me in game or on discord to setup champ and attribute points, it varies with race and gear.