Power outage, moving into TT - tractor to charge 12v?

Is the TT sitting by itself, or do you have your tow vehicle? If so, then just hook it up and run your tow vehicle to charge your TT battery. If not, then I'd try the tractor first. Check your battery voltage with a multimeter and verify that the voltage increases when hooked up to the tractor (running). It may not be fast, but would probably be sufficient. No need to buy another generator.