Definite issues:
- Durability. Best practice with high-value freight is to back the trailer against an object so you cannot open the doors. Good luck backing those monitors against something solid. Crunch.
- Weight. Trucking companies do things like switch to 'super singles' (a double-wide tire in place of tandems) to save a few pounds. They wouldn't be likely to embrace hanging 4 monitors plus whatever extra gear is needed to power & protect them.
- Compatibility. Trailers currently have standardized connectors for air, power, and signaling (turn signals + ABS + GPS if trailer so equipped). This would need a non-standard connector or at least a secondary one for video.
- Visibility. Nice squeaky clean trucks in the video. What happens a few hours down the road, or in snow when the front grille and trailer rear end are covered in spray, sand, and/or ice?
- Anti-theft. I've picked up trailers in so-called 'highly secure' yards with 24/7 guards and CCTV, and the trailers were missing basic things like brake lights, tires, even the little rubber seals on the air brake connectors that cost pennies to replace. How long to these monitors remain on your trailer when you park in say West Memphis or Baltimore and go inside to eat and shower.
It's an interesting idea and I commend the engineers for producing a partial solution, even if highly impractical for real-world use. Needs much more work though.
Also, watching that demo video the first thing that jumped out at me was how incredibly close the cars were when they cut back in front of the trucks. They filled the displays in the rear, I'd say they were about 1.5 - 2 line markers distant at speed. Incredibly dangerous for the cars, hope no one ever does that in normal driving. If you are that close to the nose of a truck and need to brake, you are getting squashed and there's nothing the trucker can do to help you. They'll be lucky to see you, and definitely won't be able to see your taillights yet. You also just annoyed them by triggering the safety cutout on their cruise control which they'll have to reset each time. This is logged and after too many of these they get called in to talk to a safety manager about their 'tailgating problem'.