Bought a 2021 GMC 2500HD AT4 at Central in Norwood about 4 months ago. SAME issue is now happening with my tailgate. Scary thing was I opened it with my trailer on and I heard a click and immediately reached to catch the inner tailgate before it smashed into my hitch. Luckily I caught it but now I'm afraid to tow with it. Super frustrating to have these issues on a truck with 1500 miles.