Fleetwood Excursion slide questions, manual process?

If like my Expedition with Powergear electric slides, you crawl underneath, disengage the brake on the end of the motor, which is a mechanical lever hiding under the rubber cap, then put a 1/2 drive ratchet in the housing and starting cranking.

I did my bedroom slide. I can't imagine cranking a big slide unless the gearing is different.