I appreciate all the replies and respect everyone's perspective/reasons for the gear choices. I feel that as bassist we just need to expect our gear to be bigger/heavier than others on stage.
I appreciate all the replies, and respect everyone's perspectives as well.
That said, I received the spinal injury that has plagued me ever since my teens, while carrying an oversized, overweight, crappy-sounding twin 15 cab down a narrow metal fire escape after a gig.
On the size issue: Bass amplification needs to be as big, as it needs to be. That's a moving target, complicated by engineering compromise, technological advances, and the laws of physics. The monster 200 watt, 150lb Gibson 2*15 stack that I was using in 1974, was the best amp I could find at the time. But it was nowhere near as good (or as loud} as my Genz Streamliner 900, powering the tiny sub-40lb wonder that I just purchased from AudioKinesis. If I ever find myself in a band situation where I need big cabs as a stage prop, mine will be empty. And the gig better come with roadies to carry them, even then.
On the elevator issue: I've played a lot of nasty halls where musicians are required to use the "servants entrance", and the exits are downright dangerous. Come to think of it, I've played some pretty swank halls that were just as bad. Double that, when it comes to outdoor gigs.
On the sound issue: We all have different ideas of what sounds best, and not everybody thinks the world stopped with the advent of the SVT. I've never owned one, but I've used lots of them as backline, and they never really floated my boat. Predictable, loud, and usually reliable, but just not my cup of tea. Meanwhile, the lightweight gear I'm using now, sounds 100% better than the stuff I was using 10 years ago, never mind the crap I was putting up with back in the early '70's.
On the cost issue: I just paid about $800 for a boutique "super twelve" cabinet, that will play as loud as I need, and goes lower AND higher than a SVT cab. I probably could have gotten a used 8*10 or a 2*15 for the same or less, but when you factor in chiropractor's bills, gas costs for a larger car, the convenience of having my wife let me keep it in the living room, etc., I think the new cab is a bargain.
If you like big gear, if you don't mind carrying it, and the tone floats your boat, good for you. But I'm grateful to have a one-trip solution that sounds the way I want, weighs less than 70lbs including my bass, and is prolonging my career by reducing the wear and tear on my spine.