I can't speak to the Ranged Tank, but if you have a Melee Tank, you can do LR-5 one of two ways, depending on your DPS arrangement:
1. The Tank can attempt to hold threat on LR-5 on the center platform while the Ranged DPS nail him from either the left or right sides of the room.
2. The Tank can pull LR-5 around the room while Melee DPS beat him from behind.
Tank can keep on the LR-5 in the center of the platfor, rdps and nail him for the the right, left, back or front...mDPS run out and plant spark bubble away from rDps/ healer and tank then force leap or force speed back into fight. Easy, just takes a little awareness by mDPS.