thumping sound in rear

I have a thumping sound coming from the rear drivers side, kinda sounds like a bent rim so I swapped the front and rear rim and tire and took it for and drive and same sound (thump, thump, thump) coming from the rear loudest at around 20mph. Did a few hard turns and realized that when there is no load on the tire the sound fades away and when I put load on the tire it gets much louder. Any idea?

Try turning down the 15's






wheel bearing


go to dealer

forgot to say also a humming sound.
If its the wheel bearing can I replace it myself, is it a big job, how much does it cost?

it's warranty work

alright thanks.

i think rear wheel bearings got extended warranty coverage of 8yrs/100k miles if you have an 05 or an 06

http://www.thel7.com/TSB/03-58-08.pdf