Fresno, I first posed that question to the forum about 3 years ago when I too lived on the central coast ( Santa Maria ). Here is a recipe that worked well for me and did not stray too far away from what I was taught was the classic. Rub your trimmed tri tip with salt, pepper and garlic powder or use Susie Q Santa Maria style seasoning (
http://www.susieqbrand.com/ ) and smoke at 250 with a few ounces of red oak to an internal temp. of 155-160. Foil and let rest for 15-30 minutes. This will give the juices time to re-distribute. My results were good to me. It had the red oak flavor and was cooked medium all the way through. Also, do a search for tri tip on the site. I came up with 81 hits. Don't know if all were on the subject but there's a lot of info out there. Hope this helps. Doc