BAR-TNK is a foe in Digistruct peak Challenge DLC
This are the heavy weapons version of the SPR-TNK. These will fire RPG rounds at you for high damage. It is made of 2 sections: The upper portion is weaker but has all the weapons. The lower portion is simply the legs but armored.
The Upper portion has lower health but can only be attacked with either precise shots or from above. The lower section is armored and hardier, but vulnerable to corrosive damage.