make sure you're using at least a 1200 watt inverter, keep the car running, and make sure the water levels in your battery are topped off. and if the items don't work well, you're putting an inductive load on the inverter, which can be corrected by plugging a small lamp, low wattage, into one of the empty plug sockets.
oh yeah, and pray that you don't screw up your alternator.
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"The genius of any slave system is found in the dynamics which isolate slaves from each other, obscure the reality of a common condition, and make united rebellion against the oppressor inconceivable." ~Andrea Dworkin
"If... the machine of government... is of such a nature that it requires you to be the agent of injustice to another, then, I say, break the law." ~Henry David Thoreau, 1849
That's right, bitches, TWO quotes!