I'm not finding many super-efficient, full displacement hulls in sub-45' powerboats. Trawler-style boats in that size seem to be mostly semi-displacement "fast trawlers", with not a lot better efficiency than full planing-hulls as Capt J mentioned. Trawler-style aft cabins do a bit better in rough weather with more bow flare, at the cost of interior space in the V-berth, and other space compromises mentioned by Capt. J. I love the look and feel of a trawler, but not the compromises. My wife and I also like being outside on our boat, and when we take off all the canvas we have a lot of open deck space with fresh air and sunshine. Early spring and late fall, we love being out of the wind with friends behind the canvas and glass. It feels like a different boat without the canvas.