Hello Markus,
I feel happier today because more people want to get involve with me in this journey. I just mentioned the SN65HVD234 as a known option, but agree with you about the autobaud loop-back and standby mode capabilities of the 235. I have also worked with SN55HVD251 and SN65HVD251, but at the end, its about a community-consensus with the permission of Arduino. So, I encourage you to move to the top of your ToDo list to find the best CAN transceiver option for the transmission between the Arduino Due processor (ATSAM3X8E) and the outer CAN world. Please, keep us posted about your tests and progress. Thank you.