Ok just measured mine. 197,5 close to front, 198,5 closer to back. Most definitely the lower springs are built for heavier load on the back.
Awning is indeed not the highest point because roof in the middle bulges.
After fully loading it I expect it to drop 1-2cm.
Is it worth to play with tyre pressure? What is the safest lowest pressure I can go. Not for driving but for a short loading ride to a ferry and back.
Got a good compressor with me to do the quick job.
Regarding the safety I am sure they have a huge tolerance on board. And not even 2m car will dmg anything.
Too many height deviations can happen during the ride inside. And for example 7 people unloaded can be a huge difference in height.
It is a question of being checked at the gate.
I suppose in worst scenario they ask for extra payment after measured? Never seen anybody refused on that ferry with numerous re-measures.