[quote=spdrun]burghMan — what if you had a provision for cameras on a trailer to send their image to screen(s) in the truck, either wirelessly or through Ethernet on the trailer harness? Done right, this could be better than mirrors.[/quote]

There are existing wireless camera systems for trailers. The big RVs often have rear cameras standard. But there different brands and no standard wireless protocol for the video. Plus it’s nice to just use mirrors as you normally do, look to the left when switching lanes to the left, check the mirror, check the blind spot etc. But I could see Tesla selling their own add-on cameras as an option. Trailer owners would have to mount them themselves, and deal with batteries, etc. but it is certainly a workable solution.