This is the local Vallejo trawler seen frequently in Mare Island and Carquinez straits. It fishes for shrimp bait.
A "trawler" in the recreational vessel sense is merely a marketing term. It means whatever the manufacturer/marketer wants it to mean. For me, a recreational trawler has full living accommodations contained in a mid-sized hull designed in partnership with an economical power plant and being unable to exceed hull-speed. On the larger end of the "mid-size" scale is this vessel: