Riding with a passenger take take a lot of extra work. Their extra weight ruins the acceleration and braking and, if they don’t lean with the bike, you’re always fighting their weight side to side. It’s even worse when you add a third person. This guy fits way more than that, and I honestly can’t imagine how.
Make sure you wait, or skip to 0:40 second mark for the true unveil for just how nuts this whole thing is. I can’t imagine sitting at, or pulling a way from a stop on this thing fully loaded down - but props to the guy for being a way bigger badass than I.