I play 6 the stringer too. Back in the 80's I had a Marshall Mosfet 100w 2-4x10 cabs. It definitely didn't sound nearly as well as a JCM but it was light and portable (compared to my regular Marshall stack) for what was out at the time. Out of all of the legendary brands that have come out with their own state of the art bass amp/cab lineups(Ampeg, Fender, Mesa, Peavey, etc), why hasn't Marshall gotten more involved in the bass gear market?
I still play guitar, as it was the instrument that I started.
Have a ton of equipment BUT..........out of everything, I only have two Marshalls, both early units, one a flats plate logo.
One characteristic of them I despise, is the lack of a clean tone that doesn't break up at low volume. Yes, the gain and master are optimized t capture this. For some reason, this seems to be a standard thing for them and I saw all of them when I worked part time in a music store.
They had one model that escapes me. Not a traditional looking Marshall amp, tubes viewed through smoked acrylic in a gold anodized frame and chassis. Liked those, but they were pricey and did not sell well, believe they discontinued them.
I ended up with Hiwatts and Fenders along with some interesting boutique amps.
Love me my Hiwatts, even played bass with them on occasion. Don't like to move them.
Plenty of other options out there that are far lighter. But I don't expect anyone to have or run those for 30 years. Why, easily replaced and repairing sort of a return on investment thing.
We can all name guitar players, bass players, not so much. Can't see anyone pushing to sponsor someone especially now in an era so sensitive on behavior. Just too risky.