Supposedly the tri-motor Cybertruck will have 14k lb towing capacity.Lippert is working on a powered chassis with Magna.
The Model Y doesn't have the payload to handle such a monster. I doubt the Cybertruck will have the payload capacity, hopefully it will.
If a self powering/regen/assist trailer can reduce "actual" load by 25%, that becomes a 17.5k lb trailer, 50% load reduction assist = 21k lb trailer.
Just need the SW for the towing vehicle to predict the best times to tell the trailer when to assist, regen and brake.
Even cooler with putting motors in the axels... self parking/leveling. Unhitch the trailer, it scoots out of the way and backs it in where you tell it to go.