The various HOV lanes aren't consistent for the rules.

520 headed to the Evergreen Bridge requires 3 people in the car to qualify.

405 says only restriction is 10K pound weight and 2 people. Trailers ok.

I-90 says 2 people and no trailers. Don't know if it lists a weight restriction

I-5 must say 2 people and no trailers based on the guy getting the ticket for his trailer.

Since I do my commute via I-405 every day I see lots of lawn maintenance trucks pulling a trailer in the HOV lane. Somehow I think they weigh more than 10K.
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zen leecher