I could see a little tiny trailer with a generator on it being a rather unobtrusive option for occasional long distance trips.I can drive my diesel more than 700 miles on the Interstate (motorway to Europeans) without stopping and when it's empty I can fill it up in about 4 minutes at any one of about 35,000 filling stations nationwide.
You can't do that in an electric.And you'll be lucky to be able to do it 20 years from now.
Probably even do fine with only a 5-10kw so long as you aren't going over mountains continuously.