Thanks for the feedback guys.
Moon Man, I decided to go with just one battery. I figured I could always add one later. All lights are LED with the exception of the factory head lights, factory tail lights, and the reverse lights. I was going to use LED for the reverse lights, but I thought these fit there better. They were also very inexpensive to experiment with. They do draw a few too many amps, but the reverse lights wont ever be on for a long time. I tried running everything at once, all lights, heater fan full blast, wipers on high speed. You do notice a slight dimming of the lights and a slow down on the heater fan motor when you flip on the reverse lights, as soon as you turn off the reverse lights everything goes back to normal. I dont anticipate too many times when I will need to run everything at once. I wired everything seperately so I can turn off stuff to save amps if I have to. Someone on this forum mentioned that you could always turn off the factory lights to save amps, and still run with the LEDs. I am pretty sure I wont ever need the second battery.