I took the chargers early in the week mostly because at that point, I had a strong feeling this would move across the 3 and possibly even to -3.5 by kickoff. I never hesitate to grab those because I can always buy off with a possible middle later if I don't like the play. Additionally, Pinny was moving strongly in that direction and when they are on your side, you are usually on the right side.
First of all, I think the Chargers are just a flat out better team right now than the Viks. Beyond that, Minnesota is pretty banged up on defense and when I made the bet had a lot of looming covid issues that could cause even more players to miss the game. That's why I had some confidence the line would move.
You're right that the Chargers do take away the big plays and the passing game and play light in the front, daring teams to run against them. They can be better against the run if they want to as run-stopping is largely a choice in your alignment. But with Minny's defensive injuries I think the Chargers will move the ball and score with relative ease, forcing the Viks to try and keep up and I don't think they can win a track meet. I see this as a relatively high scoring matchup where the points will matter less.