Hey, I’ve experienced similar issues you guys had, i have a 23 1500 ltz and i woke up to the battery dead multiple times and while working in the yard my tailgate would go up and down randomly, and i pulled into my garage and it came down, but luckily the plastic only got scuffed not the paint and thank god i didn’t have my trailer. I took it to my dealer and they found out it was the switch for the tailgate was getting water and shorted, and they are going to replace the battery, parts come in tomorrow, i will update when i get the truck back.