The best I've done is two-manned one.

Feral druid in bear with a Holy Pally.
It wasn't a quick fight, but there was never much danger of losing.
This was at late T4, early T5 level of gear. Some of the newer T5 level badge stuff, but no T5 drops for either toon.
I wasn't boxing both, just the druid, but it was a pretty easy fight.