Cooper Discoverer HT3 or Firestone Transforce HT

Just bought the Transforce for my Winnebago, 12300lb chassis, the Cooper was also offered for 100 less in price. They recommended the Transforce for the RV because of the top heavyness, they said the Transforce will wear better as long as they are kept to max psi. I know this is a month late, but I thought I would chime in. There are different reasons to run different tires.