wheel bearing?
so from that experience i would say it is not that, and usually they will make noise all the time, unless you take the weight off of them, not the other way around as you described it
and are you talking about slow turns, such as at a 4 way stop? or more when you take the weight off of that side when cornering fast?
http://www.youtube.com/watch?v=Yd7HeavWomk





