Clearman's Red Cabbage Salad

1/2 cup plus 2 T. red wine vinegar
3 T. sugar
3 tsp. kosher salt
2 tsp. seasoned salt
1/4 tsp. pepper
1/4 tsp. onion powder
1/2 cup vegetable oil
1 head red cabbage, coarsely shredded
Whisk together vinegar, sugar, salt, pepper, and onion powder until sugar and salt are completely dissolved. Whisk in oil. Dressing can be made ahead and stored in fridge. Bring to room temp before using. Pour over cabbage, toss well and let sit 10-15 minutes. Toss again and serve.