Anybody reeeeealy bored? (Heck, maybe someone has this memorized.)

So… if the rear seat was removed, what size object could you haul? Wait, I guess the right question is – what are the maximum dimensions of an item that could fit through the cargo door? 30”x30x30”? Bigger? (Doesn’t need to be exact by any means – just trying to get a general idea.)

Huge apologies if this is a "not this again" question – I searched… and failed. All I could find was depth and cubic inches.