I use a cordless drill to wind the legs up and down on my slide on camper.
I had a couple of 12V GMCs with dead chargers and batteries, so I removed the insides of the battery, connected a lead to the battery terminals and plug it into the power socket for the camper.
The GMC has nowhere near enough torque to lift the camper, but the head off an angle grinder gives me about 3:1 gearing so that it is able to do the job.
I am not recommending GMC for the job. I'm just making the point that the job of raising and lowering the legs on the camper can be done with any old 12V cordless drill if you also use the angle grinder gear reduction. If you have a 12V cordless with a dead battery and a dead angle grinder, it could cost you nothing to set up.



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