If you do manage to add another alternator, crazy or not, pictures and info!
I have often pondered that, not for lighting, but to add one of those 1500w 120v generators that come in about the size of a regular alternator. Man would that be handy out in the boonies for running an air compressor, power tools, etc. It's only 12.5 Amps at 120v, but still enough to run some stuff that would be handy having without the need for more batteries and an inverter.
Ok, 4 x 100w on the roof, 4 x 55w on the front, 620w / 13.8v = 44.92 Amps.. If you have the stock lights on as well another couple hundred watts..
Wow! Should be darn bright in the backwoods!! Make sure to holler out on the radio first Ryan so you don't burn my eyeballs out... LOL