what's this obsession with lightweight amps? I will say at the top if a person has a physical issue that makes it difficult to lift, then I am not giving you a hard time. My back doesn't feel good either, BTW

That said, it seems like guitar players are now less wimpy than bass players, heaven forbid!

Ya know a Twin Reverb weighs about 100 lbs. If a guitar player is willing to make the effort for a good sound, why don't bass players do that anymore?
I had a drummer come in for a club gig with a very small, light kit that sounded small and light. Never hired him again.
I say bring an amp that sounds great and put some backbone into it, for cryin' out loud! Life's too short for wimpy sound.
Goodnight from Lisbon.