I don’t think cameras can replace tow mirrors because you need something that has an angle that can see behind the length of the trailer. Cameras would still to have to stick out the side of the vehicle. I don’t believe that tow mirrors are required by law, but anybody that does any significant amount of towing will want them. It would be a dealbreaker for me if it did not have them. Mirrors are an example of something where style and function don’t always align. We are used to seeing big mirrors sticking out the side of standard, boxy trucks but they might not look good at all on the Tesla. Other functional accessories like running boards may also be a challenge.
The bed size is comparable to short bed F-150, slightly larger if I recall the details. Overall it seems to be able to do the same jobs that the big three “1/2 ton” models can do, and likely better.