DD492, many others:
Just to add further to the definition of a "trawler":
It isn't so much the boat, though depending only on size, the boat does need some similarity in order to do the job.
A true "Trawler" is simply a boat that hauls a "trawl". So the back end of the boat needs to be substantial enough to handle both a big net and a pair of boards that will pull the open end of the net to the bottom and keep it open while being dragged along the bottom.
When I was much younger, I spent a summer fishing, from the Fairweather grounds, to Hecate Straight, Queen Charlotte Sound, Johnstone Straight, Georgia Straight. There were lots of draggers (That's what we called them then). Some were as small as a recereational trawler, but most were quite a lot larger. I don't recall seeing any with twin power, but there may have been. I have also seen boats fitted out for dragging one season and for some other kind of fishing another. The fitting out changed what you called the boat, so a dragger could become a seiner, a seiner could become a dragger, or a packer, or even a troller. Trollers were generally not trawlers, as the stern was built with a cockpit from which to run the lines fitted with gurdeys and a big sounder, engine controls, radio and a place to throw the fish as they were hauled in. The stern was generally too slim for the dragger boards that would try to hold the mouth of the net as far apart as possible, and without the extra bouyancy required for the weight of those same dragger boards when not off the boat.
OTOH, many fishboat conversions, including Trollers, make great recreational Trawlers, but few draggers do.
So IMO, you call your boat a trawler if you want to, and all it really means is that you prefer going somewhat slower than those who don't.