Oy, the Twin Reverb. God I hate that amp---so bright, piercing, and loud. I lost some of my hearing due to that damn amp. I haven't seen an SVT half stack, but that's a great idea. With micing, who needs 8-10" drivers? The two worst things I had to help move in a traveling band were a Hammond B3 with Leslie, and a full-size acoustic upright piano (not a spinet). I was in my 20's, and my back could take it back then. Now, no way. But it's no longer necessary anyway, electronic keyboards have gotten so good.
The only heavy part of my drum gear is the hardware case, and it has wheels. Thankfully, lightweight cymbal and hi-hat stands are again in style, though I never switched from my original 60's "Ringo" flat-base ones, which I still use. The big stadium players still use the ridiculously-overbuilt heavy hardware, but they have roadies.