I mean, everything that we know about that guy so far heavily suggests he went to that rally to support the "Unite the Right" movement in one way or another.
https://www.cbsnews.com/news/james-alex-fields-jr-charlottesville-car-attack-appeared-fond-adolf-hitler/
http://www.foxnews.com/us/2017/08/14/charlottesville-attack-suspect-what-know-about-james-alex-fields-jr.html
From the articles:
"Fields’ teachers said he was an “average” student in high school who had an interest in Nazi Germany, Hitler and military history."
"Just hours before the attack, pictures show Fields at the alt-right rally dressed in the de facto uniform of a white supremacist group carrying a shield with racist symbols."

Your view of calling him a "lone wolf" is interisting though.  Did you have that same view towards the guy who shot up the GOP Softball game?  And before you answer - just remember, the internet saves everything.