King is commonly grouped - I've grouped there several times on my Druid in pick up groups.
As far as soloing the camp - I've hear of a handful of people who have done this, but I doubt the opportunity comes up very often, and you would need a great deal of gear/consumables to pull it off.
There is a great deal of adventuring available to the solo chanter/shaman, and camps are frequently open, especially during off hours.
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Grelwin, Grelroc, Grelfu, Greltwin
60 Halfling Druid
57 Iksar Shadowknight
60 Iksar Monk
20 Halfling Druid
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