J-40 for Long Distance Cruising ?
D, GYRPHON is only one example of J40''s used for extended cruising. There''s a J40 website with some useful info on conversions and construction issues that I''m sure Google will produce; sorry that I don''t have the URL handy.
Still, it''s a relatively small volume hull and I think load carrying and storage issues, as you mention, would be one of its liabilities. E.g. we saw a J40 that was being cruised down in Bequia. Because the crew had decided that the boat absolutely had to have all the ''normal'' cruising gear (acres of canvas, solar panels, wind generator, wind surfer, on-deck jug farms due to its limited tankage, and oodles of other gear), it was down on its lines and looked like it had horrid windage. It seemed to me at the time the choice of the boat was made well before decisions about what the crew thought they needed from their boat.