> I can extend my range by 200-300km by carrying extra fuel. This is not possible with electric cars

I've wondered about this. What if for a long EV car trip you put a small gas or propane generator in the trunk or a small trailer, and ran it to provide some charging while you are driving and/or when you stop to rest or sleep?

Could that provide enough extra to overcome the losses from carrying the generator and fuel for it, and if so, could it be enough to make a noticeable difference?