In that case I would drive a bit farther south to near Ukiah and take 20 east. At the top just before you get to clear lake you can cut off arou d the south side of Clear Lake. This will get you back on 20 east of the congestion. From there its a fairly easy drive to I5. Remember the CA fires, so how you get east from there is up to you. As an alternative, from Brookings you could head east on 199 and 140 to Klamath Falls, jog to Alturus and pick up 395 south. That will put you east of all the fires and avoid most of CA. Remember CA limits you to 55MPH towing.