Yes it would have a front faring. All the cameras would be in exactly the same place... the dash camera may need to be different but could be on a bar that swings our of the way for loading/unloading, and the side pilars would need a verticle bar too. If you loaded a piano or pool table that might be a problem with the FFC. It would be better if the FFC could just be mounted high in the front on the faring, but like you said it would not see EXACTLY like a M3 anymore.
No accommodations/expenses for people would be the entire point. Hopefully cost $20,000 with 150+ mile range. So $18,000 more than a trailer, but $80,000 less than an EV truck, and it would haul a lot more. And you could rent it on the TN and make way more than the $30k/yr a M3 would make... and you would rent it because nobody pukes in a trailer.
Where I am not sure this works is where you have a M3 and want to go surfing or have other cargo that is just too big/bulky/scratch&stain prone to go in the M3. Do you take an ICE SUV, this “all bed self driving trailer” or do you add a tow hitch and put a carrier on. We have a vacation rental and use our old ICE SUV to carry all the supplies/equipment. I don’t have a good EV option but don’t know that my self driving trailer would be better because in this case it is overkill. However, if it cost me $20k and I could rent it back out for $30k/yr I would get over it pretty fast.