Hello Bryan
My setup is almost the same as yours. I use 2 x 30amp deep cycle batteries connected to 4 cig lighter sockets (2 banks of 2, switched and fused separately).
The 60amps gives me about 10-12 hours observing time, running all that you mention.
If you wish to get more than this time without recharging, then bigger batteries are required (or 3 nights of 3 to 4 hours each night).
If you want to know more about these batteries then look at
http://www.yhipower.com.au/2007/main...formation.html
Good luck