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Stir salt, black pepper, garlic powder, paprika, onion powder, rosemary, and cayenne pepper together in a bowl. Place Tri Tip in a glass baking dish and coat beef on all sides with the spice mixture. Cover the dish with plastic wrap and refrigerate for 1- 4 hours.
Combine vinegar, vegetable oil, crushed garlic, and Dijon mustard together in a sealable container. Cover the container and shake to blend ingredients.
Start the Traeger grill on Smoke with the lid open until the fire is established (4-5 minutes). Set grill on High and let pre heat (10-12 minutes)
Remove meat from fridge and place on preheated grill and brush with garlic-vinegar mixture. Cook meat for 5 minutes, flip, and baste. Repeat the flip and baste process every 5 minutes until beef starts to firm and is reddish-pink and juicy in the center, 30-40 minutes total or until the internal temperature of the meat reaches 130 degrees F. Enjoy!