I don't know if you have the air suspension or not - but you may have the same problem I did (with or without the air suspension).
On my Rebel, I started to notice a grinding sound when in Entry/Exit level and executing a turn (almost always to the left). Several trips to the dealer did not result in any solution. After the last trip, I turned right around before I left the lot as they did not resolve the issue (I was HOT). I got lucky enough that one tech jumped underneath the truck right then and there. He diagnosed it as the wheel well liner bending out. My tire would grind against it when the truck was lowered and turning. He bent it back into place (no heat gun or anything). It has mostly stayed back in place every since (3+ years now). On the rare occasions it does seem to come back down, I simply go back in and bend it back up.
I imagine a heat gun would likely let me do a better job of this (not sure why I never thought of that before, duh!). I expect that is your problem and likely all you will need to do to resolve it.
