I just picked my Voltage up after 3 months in the shop for warranty work (more to come on that later), but I still have clicking/popping noises coming from the Happijac bed when lowering, they said this is normal.
Chris & Donna
2014 Voltage Epic 3990, 600AH Lifeblue, 1895W Solar, 3K Magnum w/AGS, 3X Micro-Air ES
2018 RAM 3500 Laramie Sport Crew Cab 6.7 Cummins, AISIN 4X4 DRW 4.10 Long Bed Dually 2004 Sportster 1200c
Mine doesn't do that in our Rubicon (or the Sandstorm we had in the past). It almost looks like on the video, when the bottom bed is lowering after the top one has reached its stopping point that one side is lowering faster than the other. Maybe its just the angle of the camera?
Maybe a gear is out of alignment. Have you tried lubing the chains?