A 2013 should not be bad this soon, there are cases listed on this forum of the infamous coupling knock you speak of and most just used a grease gun and needle to fill up the boot with grease...those were the 07 and 08 years as I recall.
08 JK 23S - Colorado Jeep Club No. 204
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"It takes a special kind of stupid to believe criminals will follow gun laws."
I do not consider myself a smartass. I point out the obvious, search for the truth, and speak fluent sarcasm. I am, by experience, an accomplished curmudgeon.