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If you have a second battery, which is wise I think if you want to run power-hungry accessories, then you could pick up one of the new generation power inverters from dicksmith that will take 12V to 240V. Then run your standard laptop arrangement off that. I realize there are power losses in this arrangement but they are not "huge" and will be assured of getting the right voltage to your expensive laptop. Up at our astrocamp we regularly run electric blankets off inverters, with timers, to warm our beds for a few hours as we go to sleep. It's all a matter of battery capacity.
A supercheap 70Ah 4*4/marine battery will set you back $120 and an inverter about the same.
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