My D19 came with two sixes in series, positive ground, so that was the way I ran it for 30 years. Then, a couple of years ago the batteries went kaput on a holiday weekend and our local farm store was out of sixes, so instead of driving 30 miles I just swung into Walmart, bought two 12's and hooked them up parallel, still with positive ground.
Then, this summer the generator quit so I converted it to an alternator and negative ground. Same two batteries, still doing what they're supposed to.
Also, I've run two 12's in parallel on a 4x4 pickup with a snow plow on it for years, for the extra amperage both for starting after it's sat for a month in cold weather and for running the lift on the plow. No problem with that, either.
Most diesel pickups come from the factory with two 12's in parallel. If there was an inherent problem with the setup, I doubt they'd to it.
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