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The P in P195/75R/14 stands for Passenger car. Your tires have lighter construction and less protection than proper truck tires. I wouldn't use them but you might be OK if you have good roads.
Truck tires meant to be run as duals usually have two max load ratings. One for single and one for dual use, which is generally about 10% lower. Since car tires aren't designed to be used as duals I would go even farther and drop your safe range from 1400 to 1200lbs each.
You are still within the safety margin if you really do have 70% of the weight on the rear but I would seriously consider driving to a highway scale that weighs individual axles to find out what the axle loads really are.
I would also consider buying some spacers for the duals if you plan on keeping the tires. A 1cm spacer will give you the clearance needed between the tires but keep in mind the outer edge of the outer rear tire will be about 15mm further out than stock.
Even with the spacers I would be concerned with the tires rubbing on turns etc with their light casings and low pressure. I have never been a fan of running pressures higher then the rating and feel it makes you more susceptible to flats.
So in general I wouldn't do it but if you are consider spacers and keep a close eye on your tire pressures.
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