Ask Joe Nerve!!!!! 
Seriously, though, back in my actual touring days, before I switched to pre/power amp setups, I had 4 SVT heads atop 4 8x10s. Only ran two at a time, the others were backup, all patched in, tested, and sitting on standby.
If I got a whiff of the magic mushroom cloud I could stroll over and bring a backup online with a flick of the switch, mebbe one more to silence the cookout culprit.
If a stage tech didn't beat me to it.
When I went to Alembic pre-amps and Crest 8001 pwr amps, same story. 4 Crest's racked up and 16 2x10 R'n'R cabs ( Bag Ends with castered front covers).
Never lost a Crest, cooked a couple SVTs.
My ability to stand upright today is testament to my never having to carry them!!

Seriously, though, back in my actual touring days, before I switched to pre/power amp setups, I had 4 SVT heads atop 4 8x10s. Only ran two at a time, the others were backup, all patched in, tested, and sitting on standby.
If I got a whiff of the magic mushroom cloud I could stroll over and bring a backup online with a flick of the switch, mebbe one more to silence the cookout culprit.
If a stage tech didn't beat me to it.
When I went to Alembic pre-amps and Crest 8001 pwr amps, same story. 4 Crest's racked up and 16 2x10 R'n'R cabs ( Bag Ends with castered front covers).
Never lost a Crest, cooked a couple SVTs.
My ability to stand upright today is testament to my never having to carry them!!