Noise like a wet tire rubbing on the curb. Seems to come from passenger side rear. Occurs at slow speed. Volume varies from a wet tire sound to that of a police siren. Back to dealer 3 times-no help-can't hear anything.

I have an 04 Highlander I've had it for 6 months. I don't hear any sort of noise.

What I would recommend is that you take it to another available toyota dealer, to make sure the one you usually use didn't miss something. If it's till not fixed, then think about pursuing a lemon law. If you like the Highlander, you can find another dealer, and get them to trade yours in