If your batteries are good, those two 6 volt batteries should be more than able to provide enough current at 12 volts. What may be happening is, you might have loose connections somewhere in the circuit to the leveling system, and if so, that will cause poor voltage. Try to get to every connection you can find and tighten them. You might be surprised how many loose connections you may find.
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Bob & Becky
2012 3402 Montana
2012 Chevy 2500HD D/A CC
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