Yep, had ours less than a month & I have the scars to prove it, I'm no giant at 5' 6" & being follically challenged doesn't help although, I can at least walk under the roof when it's down & Mrs A is okay as being only 4'11' she can manage the whole van & the door.
Luckily, it shouldn't be too much of an issue in the 554 with the french bed, the low roof is only accessible over the 'U' shaped seating area & the table takes up most of that, however, I've already donated a healthy piece of scalp to the light fitting so that is getting replaced by a slim LED, anyone want a opaque marbled glass fruit bowl?
We had to do a similar exercise in the M/home we have just sold as the cab area was considerably lower than the lounge. Only did it once, jammed a thin strip of material under a bit of trim so it hung down in the middle of the gap, which fortunately was quite narrow being between the front seats.