Perhaps that isn't actually a passenger ferry. There doesn't appear to be any passenger cabin above the main deck. It may have been a feight/work vessel- it certainly isn't familiar to me. Unless the angle is deceptive, it also appears that the main deck structure is closed in at the rear, making it unlikely that it's over a car deck.
Something I've not seen before: a shot of the Rolf Bruhn on the Hornby run. This would be from the brief period between the ending of the Savoie family's service with the Lorraine S, and the introduction of the Albert J. Savoie (formerly Westwood) to the run. I'm assuming this is Shingle Spit, before the dock was built.
From 'Exploring by Bicycle', by Tim Perrin and Janet Willson.
(Request for moderators: Could the thread title be changed to include the name Rolf Bruhn, for future reference?)