Bolt-on generator head to bus engine?

[transit360]

Question about providing 110V my Partybus project:
I'm running through ideas to power at least 1000 watts in my
Bluebird to power 110 V TV's, DVD, lights, etc while entertaining
parties. 99% of the time the bus will be running also.
THOUGHT #1: I was going to mount a gas generator, but there's
not convenient locations on this shuttle bus. Except in the rear
where the engine is, and I'm worried it may cook my generator or
worse yet damage the Cummins from lack of airspace taken up by
boxing in the generator to protect it from the heat the diesel puts
off.
THOUGHT #2: To get a bigger alternator or a separate alternator
and a separate battery bank. I've seen other partybuses and limos do
this, but I'm not familiar or confident about this method. Anyone's
experience with this I'd like to hear.
THOUGHT #3: My third thought - and this is the one I need
addressed - is that I've heard of bolt-on generator heads that you
can have driven off of your bus engine. I'm not sure how these work,
but they sound great b/c I could just use engine power to turn the
generator head and produce the 110 Volts. Since the bus is running
anyway, I might as well use some of the 8.3's power, right?
SO, has anyone seen these bolt-on generators? How about the
high-amp alternators? Where can I get each of these and how much do
they cost? What kind of engine RPM's would I have to run to get some
decent charging out of them? I already figured I'd have to leave the
fast idle on to help them charge more efficiently.
Any advice would be greatly appreciated.

Steve
2 '98 Bluebird QBRE Partybuses