hard rattle right rear, can't find

What is your question?

When I hit a sharp bump, I get a hard knock in the right rear. Sounds like body but can't find anything. Checked shock and spring mounts, all the stabilizer connections, muffler, don't seem to be any movement in rear door or window

What makes this problem better or worse?

hard bumps

How long has your 2015 Jeep Wrangler had this problem?

since purchase, used