I had the same problem. What worked for me was to adjust the the tailgate latches, strikers so the tailgate closes tighter. Now, if I could just figure out the passenger rear door rattling on every bump.I have a 2022 Tundra 1794 and the tailgate rattles and is loose. Anyone else having this issue? It’s been to 2 dealerships and neither have addressed or acknowledge an issue. Very frustrating….