A B&J Press Camera is quite handholdable, particularly if you've got a working, calibrated rangefinder. When I travel with the Tech V, I usually don't bring another camera, since I can shoot it rangefinder or view camera style. If you shoot with the rangefinder, that's another reason to use Grafmatics. They're very handy for portraits and handheld shooting, where you want to change film quickly (0.5-1 fps, if need be, once you get the hang of it).

If I want to go light but still have 4x5" as an option, I'll bring the 4x5" Gowland PocketView and a medium format folder.