If you're going to "de-rate" the tires by inflating them only to 80 psi, then why get the GY tires at all? Save a bunch of money by going to Sailun tires, if you're determined to get G tires. Save even more by going with Michelin Ribs or Bridgestone Duravis R250 in E-rated 16" tires. Just my $0.02...
Lyle
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X2.
The only way to take advantage of those higher capacity 3750 lb/110 psi G tires over a 80 psi E tire is to use the higher pressures. Other wise their is no benefit from derating the tire.
Just makes cents/sense to install the right stem and get the benefit of those higher priced/higher rated tires.