If your batteries are old and not totally up to snuff, it will take more time for them to reach the required voltage so they can produce the required amperage to run the leveling jacks. Since replacing our flooded lead acid batteries with deep cycle AGM batteries, the wait time for using the jacks is less. In my opinion, if you add batteries to the coach battery bank, and if those batteries are not fully charged, it could take longer for them to reach a level that will allow the jacks to operate, because the charging current will be divided between more batteries.
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