Do the rear seats fold down? I can't find anything in the owner's manual that says they do, nor can I see an obvious way to do it. So maybe they don't, but that strikes me as odd.
In the top left and right of the trunk there are levers you pull to release each rear seat, at which point they'll fold down easily.
I thought that was the case but when I was in the Home Depot parking lot the other day I couldn't find the levers. I'll look again this evening when my wife gets home with the car. Thanks.
The end result of folding the rear seats isn't all that satisfying. This is one area where Honda failed in the design. There is a sort of pass-through window rather than a full opening. We've made it work for us but the hatchback Prius was much better in this respect.
The body needs that lateral brace to stiffen it because, unlike the battery case, hydrogen tanks are non-structural - and Clarity was designed to host both.