Sounds like you may have problems with your tank because a 20 gallon tank should be in the 5 gallon drawdown range.
But yes you can have two tanks in parallel.
A good rule of thumb is one to one in gallons. Your 12 gpm pump should have 12 gallons of drawdown to allow the pump to cool between cycles. Depending on your pressure settings this means you need a bladder tank in the 35 to 50 gallon range or a equivalent tank size (non bladder tank) in the 80 to 120 gallon range.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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