Still I can imagine there will be times when a cab would come in handy -- especially if poor PA support ever comes up. But my fEarful 15/6, which I love by the way, just seems like too much cab for the job at these shows. It sounds amazing of course, but that doesn't matter if it contributes nearly zero to the resulting sound. Rather than lug the 15/6 around I'm thinking it might be time for a smaller, simpler replacement that would just shoot a simple, no-crossover signal at me when needed so I need things aren't going completely to hell. I'm thinking some kind of combo that I will be able to hear on a loud stage if it's pointed at me (maybe stand-mounted for proper height) and will also sound good miced, but doesn't necessarily do the thundering lows of the 15/6 or the PA system.
On the flip side just about every gigging bassist I talk to brings something as big or bigger along, and many of these guys are legitimate pros and veterans, not weekend warriors like me. Maybe they are onto something bringing those big cabs all the time--I'm just not sure what it is.
I will say this... the handful of times someone has miced my cab for a show it has sounded quite magical, even if taking a line from my preamp stage has been way more practical in lots of situations. The Kappalite 3015LF driver really captures the low notes with a clarity and heft I have not heard elsewhere except a good PA... which is what got me looking at a fEarful in the first place.
I'd love to try your cab, it would be a natural "downsize" from my bigger fEARful. I bet the 3012LF sounds great. I want to see that awesome-looking 4004 too!