Slide motors operate on 12 volts , if your coach batteries are dead and the gen set won't run , starting the coach engine would be the next step, failing that , jumping the house batteries from the toad.
Anything that charges the house batteries in the coach , including 15 amp power from your sticks and bricks will help operate the slides, but if the batteries are stone dead , you run the risk of over loading the converter/charger , so you should plug in and wait till the batteries charge before operating the slides.