[RKK3]

I believe I have the same issue. I can only hear it if I am backing up at more than just an idle. It happens when I am in reverse and I give it a little quick throttle. You can hear a thud or creak of some kind. It makes sense to me that it is the bushings on the suspension. Do you think this sounds like the same thing? Let me know if it resolves your issue and I will be sure to bring it up the next time I bring mine in to the dealer.