I had to assume it’s an old picture and the trailer is not easily accessible, perhaps in off-site storage.
I also assume he Is looking to make an inexpensive DIY pet slipcover, not a professional reupholstery job.
Alan, if you don’t get the information you need here, a phone call to
Casita should do it. BTW... the photo appears to be a 17’, not a 16’, correct? Thinking it might make a difference.