A "trawler" (the term is very imprecise) is merely a powerboat with living facilities. There are many options. If one is satisfied with usual sailboat speeds, then a "true" recreational trawler only capable of reaching hull speed and is very economical fuel-wise if operated one-knot below maximum speed. If you want to go faster, then you want a cabin-cruiser or the oxymoron "fast trawler" having multiple engines for propulsion. The usual "trawler" has a flybridge with two engines and will exceed hull speed. However, that isn't mandatory for a trawler.
Aside: I much prefer being in an enclosed pilothouse rather than being exposed in a cockpit or flybridge after decades in a sailboat's cockpit.
Was 64-years old when "graduating" to a trawler.