THANK YOU! I too have this loud “clunk” brand new truck....I switched from Chevy and already have an issue... it’s really disappointing. Video doesn’t even convey how loud this clunk is. It’s VERY EMBARRASSING. People look at me thinking I hit something when starting the truck. You would think Ram would be all over this so their trucks aren’t out there clunking all over the place. It looks, sounds, bad for the brand...
It might help to get the mic under the vehicle to better capture the sound. Hopefully you are aware some report a light brake pedal application upon startup eliminates this issue. It isn't a true fix but at least it partially addresses the cause. It seems that about as fast and good as it gets with FCA these days.
FCA has a few growing pains with the new body 1500's. Maybe that's one reason FCA plans to continue offering the classic body (4th gen) next year (2020) and even possibly after that. Gotta wonder what the future holds for 5th gen Ram 1500's when Ram still has 2019 classic body recalls.