It appears all bulkheads are the same height. They reach the roof in low roof vans. For medium and high roof vans they are fitted with the overhead luggage shelf unit which reduces the cab internal height to that of a low roof van.
mk7 08reg 2.4 T350 LWB MHR RWD mk6 X reg 2.4 T350 LWB MHR RWD - scrapped mk4 J reg 2.5 L300 LWB MHR RWD - sold on Notice a trend there ? not too big and not too small