Which van has the most Interior Space?

Anyone know what vans have the most interior space? Im leaning towards an e350 with an 18’’ roof raise but curious if the promaster or transit have more buildable space on the inside. Cant seem to find much good info on the internet so any specs would be much appreciated!

I believe the Promaster is the only van where you can fit a full size bed parallel in the back without modifications.

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