I have a friend who just bout a new Winnebago Class C. He said in order to put the slide out the ignition has to be on or the engine has to be running? I did not question it because I have never had...
On my travel trailer, I would often blow the slide fuse if I tried on battery. I used to keep the wiring harness to the tow vehicle and the tow vehicle engine running. Never blew a fuse that way. Or, better yet, plug into shore power before deploying slides.