Thanks for help on mine.
We have similar problems. I'd tempted to go with Cam just for the possibility of big rushing gains on broken plays, but the fact is Carolina's time of possession is probably going to be limited due to many 3 & outs.
Honestly, I don't really care for Freeman's match up either (your Vikings have a considerable defense as well). Also, for what it's worth teams have scored 8 points less than their average totals on these Thursday night games.
So basically I'm not much help. I'd go with Freeman just because I think he'll get more possessions, but it's pretty close.
I just hope my fantasy team is better than the Chargers this year.