Although interesting. Not all that applicable in the real world. Weight doesn’t matter nearly as much as air drag. I would say there are very few people if any flat towing pick up trucks every weekend behind their pick up. Only possibility on this at any scale or off roader with purpose built rigs and people with track cars. These tests would be a lot more helpful if they were pulling a 23 to 25 foot 7000 pound camper. Even a 15 to 20 foot boat, something people would regularly transport and ramp launch. But these heavy and relatively aerodynamic loads that people don’t regularly tow aren’t all that helpful
No one should be surprised that EV trucks will pull very well and out perform ICEs. They are more powerful, heavier, and have a lower CG. It’s sort of like the fact that EV cars are better than ICE’s in almost every way. Range while towing and charging infrastructure is going to be what determines if and when it is realistic to regularly tow with an EV truck