Thats a series hybrid idea. they are already doing that, however, car industry has been exceptionally poor in making a efficiency optimized generator mostly because their R&D depts have been tweaking engines that operate over a big rpm range to send power directly to wheels. the design gets much simpler if you are making a high efficiency generator. recently companies like Aquarius have done some work on that.
That said, the main utility for hybrids is in stop&go situations where gas engine has to operate over a large RPM range and energy is essentially lost in stopping. In case of big rigs I actually agree that you need full electrification (or maybe ammonia/H2 engine IFF conversion efficiency to carrier is high). We 'just' need to get the battery energy density up 30-40%. Quite doable IMO.
That said, the main utility for hybrids is in stop&go situations where gas engine has to operate over a large RPM range and energy is essentially lost in stopping. In case of big rigs I actually agree that you need full electrification (or maybe ammonia/H2 engine IFF conversion efficiency to carrier is high). We 'just' need to get the battery energy density up 30-40%. Quite doable IMO.