Ok so here's the update - just got the KJ back and the big problem was that the shop it went to last night (where they tightened the caliper) didn't tighten everything down ... supposedly. The dealership said that the caliper was still loose and that since one of my lug nuts didn't have the cap on it, that could've been it too. They also rebalanced the tire, saying "that could also have been making the noise". Grrrr I hate dealerships!
Thanks all! I'll keep this post updated if it comes back... again

i knew that's what it was - loose caliper. same thing happened to me.