Interesting German camper concept

In addition: is it self defeating?

That's a little trailer that would normally be about 3000lb...the battery pack is roughly the same as a tesla which runs about 1200lb...do now you have a 4200lb trailer that runs into issues with hitch weight, CGVW, braking, etc...so you have to upgrade to a more capable tow vehicle which wouldn't struggle with a 3000lb trailer in the first place.

Does the EU operate on different laws of physics?

So what if the trailer helps push or whatever? Rarely is lack of power the reason a towing combination is unsafe.

Yes, interesting. A "powered" travel trailer... they are claiming you could safely tow a larger TT with a small vehicle, because the "felt" weight you are towing is reduced dramatically. Sounds iffy... what happens when the TT's battery dies during the trip? Suddenly you have a dangerously overloaded tow setup. "Tail wagging" could take on a whole new meaning when the tail has its' own power!

The idea of being able to move the TT AFTER it is disconnected seems like a great idea.