When the volume is up, I love my jeep. It is so sweet to accel, take turns, no rattles.. I don't know how high vol makes it take turns better (maybe because the loose stuff in my cargo is not audible, that's why), and also the high engine rpm gets silent so you keep pushing it.. Feels like it leaps better.
But this rattle comes from somewhere near bumper/fender. If you move that fender, just shake it a bit, you will hear a similar noise. The fender and bumpers are not completely secured, they move around. I hear similar noise when I am idling or backing up when the engine is cold (high idle rpm)
I totally agree with the noises in the jeep, it is one circus in there.

Sometimes I just point my ear like a bloodhound and try to detect where a certain noise is coming from. They all seem to disappear during weekend when I get in my jeep with purpose of locating and fastening whatever is loose (recently I started hearing something from the seatbelt adjuster on the pillar)