Here are the armorings, mods, enhancements, barrel, implants and earpiece I use to outfit Treek for healing and tank. These are really starter mods for endgame (Level 55) play.
Healing:
Reflex Armoring x8 Agile Mod x9 Adept Enhancements x3 Quick Savant Enhancements x4 Overkill Experimental Reflex Implant x2 Overkill Supercharged Rejuvenation Module x1 Reflex Barrel x1
Tanking:
Commando Armoring x8 Deflecting Mod x9 Immunity Enhancements x7 Redoubt Experimental Response Implant x2 Redoubt Advanced Cosmic Combat Module Earpiece x1 Commando Barrel x1
Edited 8/22/2013 for corrections armor count and earpiece name