… but it has a 15 inch longer wheelbase than a Toyota Sienna, because of that choice to put everything between the wheels. That’s the length that matters for the beam stress. Which, if I recall correctly, goes as the square of the length. Which is probably why minivans sit up on top of the wheels… which makes them taller. And being narrower and shorter (on edit: meaning vertically) than the minivan actually reduces the rigidity of that unibody.
Anyway, I’m not necessarily saying you can’t make it a unibody, but it’s going to have to be a lot thicker unibody, so you’re trading weight against height, with either one costing you in sticker price and fuel economy.
… but it has a 15 inch longer wheelbase than a Toyota Sienna, because of that choice to put everything between the wheels. That’s the length that matters for the beam stress. Which, if I recall correctly, goes as the square of the length. Which is probably why minivans sit up on top of the wheels… which makes them taller. And being narrower and shorter (on edit: meaning vertically) than the minivan actually reduces the rigidity of that unibody.
Anyway, I’m not necessarily saying you can’t make it a unibody, but it’s going to have to be a lot thicker unibody, so you’re trading weight against height, with either one costing you in sticker price and fuel economy.