My tailgate has a slight rattle that has been increasing over time. There is a bumpstop just below the latch mechanism with a rubber pad that looks like it may be semi adjustable. The portion on the gate has two bolts and I'm thinking I could loosen these and adjust the bumpstop so it's closer to the body thus making a snugger fit with portion that is on the body. The portion on the body also has two bolts.... My service manual doesn't talk about these parts nor discusses adjusting them. Has anyone messed with them?