I have a couple of Jeff's slipjoint knives and I would second the recommendation.
Jeff will tell you he believes in making working knives and putting as much blade as possible into the space available, so there is a possibility of a little bit of minor blade rub. Indeed, both of mine show some minor blade rub, but both are two blade, single backspring models (half congress and serpentine half whittler). Might not be an issue with a trapper.