I have about 12k on my 2013 F-150 that I’ve had for about a year. Most recently I noticed a squeak that seemed like it was coming from the rear. It was noticeable at really low speeds, it wasn’t loud or clunky… only a squeak
I thought for sure it was the suspension because when I jumped on the back of the truck it I could get it to make noise.
It was actually the tailgate pivot points and latch. I sprayed some white grease on the pivot points and the latch on both sides. The squeak went away.