I dont think there's a one trick build. but for leveling I do 30 into vitality trait. and take 20% shout reduction and shouts heal trait.
paired with "for great justice" "on my mark" and "shake it off" you are extremely hard to take down. especially since at lvl 80 each of them heal 1-2k in an aoe (affects allies too) and each have like a 20 second cool down. so thats 3-6k burst HP heal