Check the photo of livestock transport on the Searoad Mersey operating out of Devonport on 30.3.2015. Apparently it is fine just to leave sheep trucks parked on this unacceptable angle onboard. Whilst admittedly it makes little difference whilst sailing (provided internal gates shut) as every angle will occur due to sea movement (just one of those delightful welfare issues of sea transport of stock), these sheep, had to cope with being parked on an incline during the loading period (photo taken two hours before sailing) and the unloading period (probably also some hours). So, discomfort before and after a voyage which is known to be difficult for stock, as acknowledged in the guidelines.
And, could it be that there are more livestock trucks behind the upper green hull/ partition on the lower level?
No potential for cross breeze if so.....lucky Bass Strait is usually pretty breezy as it was on that day.