alternator idle amps

[Optimistic Paranoid]

And that seems to be the main problem.
  Hmm, the dual circuit with two alternators, (one dedicated for house only with a higher regulated voltage) might be a viable alternative, but may be a pain to set up a mount for it. Also would need a spare crank mounted drive pulley. Could possibly look at a dual alternator ambulance set up?

The world of high end car audio frequently needs multiple alternators to power insanely huge amplifiers.  Do a Google search on "Multiple Alternators" and go for "images" and you will find numerous pictures of underhood setups with two, three, four and more alternators being driven by the engine.  I suspect brackets and pulleys are available from those people.

Example: