Hmmm. My son has a power inverter. You can get them at Best Buy, etc. It is 400 watts, and is plugged into the ac or dc of your vehicle. They do come with less or more wattage. My son's has 4 outlets on it. We used it to go on a trip and I used the laptop and portable DVD player-plugged them in. Takes very little power, but maybe a smaller sewing machine for piecing etc. would work. Just get a table contraption for your back seat, have DH do all the driving, and you are in business.