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The leveling systems generally need a full charge from the batteries. And they typically drain the batteries quite quickly. Even a fully charged battery (especially a marginal one) can be discharged enough as you are working the jacks that the last one will not work.
The batteries Thor uses - or at least were using - were fairly cheap, so even when fully charged, they may not be up to task.
If you have one house battery, upgrade to two. If you have group 24, try replacing them with group 27 or 31 if they will fit (the higher number group have more capacity).
Also, run the engine while manipulating the jacks as the extra battery/alternator power from the engine might be enough to run the jacks.
Also, the LCI leveling system should have a manual override function where you can run the hydraulic pump with a drill. Download a manual or search YouTube for the procedure. That might be enough to get you home.
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