The FACT is D or E tires will take the exact inflation to carry the same load. Inflating E tires to 80 when 65 is plenty will cause worse ride, center tire wear and further stopping distance. E tires at 65 will be a stronger tire at 65 than a D at 65.
Personally with the quality of the ENDURANCE I would stick to the D tire if you are not overloading it.