To say I am amazed is not doing the English language justice, 6000 Miles from Ms to AK must have been via a round about route indeed. My Driving recollections would guess it is more like 3800 miles from St. Lou to Anchorage... But then I was not in your mini van or shoes...
However the real comment is this, why don't you just get a 40 dollar inverter, plug it into the ciggie lighter hole or hard wire it and you have all the commercial type (117VAC) power you need, I ran one in my semi for years, have one in my Dodge Nitro and it powers my Dell Laptop, The HP printer/scanner I use for my business, charges my cell phone, razor and anything else I need up to a 800 watts of power. Rather than trying to re invent the wheel, why not use the technology that is available, and in common usage by almost every truck driver in the USA.
DE Jack KD1PE
I was able to run that computer charging off
my wife's Ford minivan for the 6000 mile trip from MS to AK in spring of 2004. The vehicle voltage is damped by the car's battery and runs about 14.2 volts when the engine is running and sags to 13.2v when off. I never had the computer running when starting the engine. The computer battery will also act as a huge capacitor for smoothing out any voltage spikes.
Most cigarette lighters circuits have a 15 to 20 amp fuse on them. That ought to work fine for charging/using with your computer.
73, Ed - KL7UW