I personal know many of the brothers on superbowl 6 , 3cx10000A7 , are baby amps !! The highest output mobile that I know of (personally saw it & know the owner) does 50 kilowatt plus & uses 8 huge alternators on the engine with Peter Dahl transformers........ 20 , 30 kilowatt mobile are common place ....So when someone tells me they have two 8877 in their amp, I just laugh & say that it would make a good driver amp !!
John