Pre-Covid, we used to travel reasonably regularly down to Seattle and destinations in between - mostly day trips.
Trust me - you haven't seen suspicious until you have been questioned by US Customs!

In general though, I'd say suspicion goes with the job. And California residents in a rental car travelling through a port that isn't the most direct route would be likely to attract attention.
During our trips, we make it a practice to listen to the Canadian AM radio station that broadcasts border lineup reports regularly about the four main crossings close to Vancouver. We have crossed at Abbotsford before, even though it is the farthest from our home, because the reported lineup was the shortest. We tend to get questioned about that too, but the border report answer is usually enough.