I think every manufacturer has slightly different procedures. On my Thor, parking brake must be set and engine running to extend the jacks. Conversely the slides will not extend or retract with the engine running. I'm not sure if the slides are parking brake dependent, since it is always set after deploying the jacks.
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Bruce Dickson 2013 Thor Challenger 37GT, 5 Star Tune, Safe-T-Plus Steering Control with Air Trim, Roadmaster front and rear Sway Bars, SuperSteer rear Track Bar, Crossfires, 2018 Honda CRV . Full timers since Jan 2012.
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