IMO, I agree with the others which say you may not need it. However if you watch the "Hot Weather Towing, Progress report". In the Rivian videos you can see the setting up the WDH when hooking and unhooking. (See 4:00, 5:30min) Keep in mind they were towing a trailer around 11000lbs. Which is...
My ideas are not as high tech.
-bluetooth link to third party or from Rivian Camera that can be mounted on back of your trailer.
- Aux relay panel for lights etc. That has programmable controls on the UI.
-Weather sense, that would roll up windows close bed cover when it starts to rain.
-app...