What is the extractor you have now? Assuming it is electric, what does the plate on the motor say? It should list power, voltage, full load amps (fla), phase, frequency, those sort if things.
Going to assume you will be out there with a truck. Depending on the size of the extractor, and those motor nameplate numbers, you could potentially power it from the truck electrical system. There are ac/dc inverters that can convert the truck power (12vdc) to what the extractor requires.