Rub/Grinding noise coming from right rear

I'm trying to get some opinions on what may be wrong with my truck before brining it to the dealer. I have a 18' DCLB Sport with about 2500 miles on it. Whenever I make a left turn at low speed, I can hear a fairly distinct rub or grind coming from the rear. Im not sure if the noise is coming from the left or right, but defiantly the rear. Everything seems find when I turn right. Im sort of hoping its something fairly simple like a wheel bearing, but this doesn't strike me like a wheel bearing issue. Any idea? Really hope its not a vital part of the drive train.

 

Spare tire loose? Check the exhaust by shaking it held up by rubber