Is everybody using G614s changing rims, or are the OEM rims capable of running at 110 psi?
Scott
Easy way to check with factory wheels (although not perfect)- how many spokes 5 = 80 psi, 8 = 110 psi wheels.
FWIW, my wheels, as well as others here, are not marked on the inside.
And with Jon's rec, 17.5's will be about the same price and a HD tire, if you have to buy wheels.
Since you have 6 to deal with, I would consider just upgrading the tires. You have an extra axle that kind of negates the gain with the 17.5's
You'll never take advantage of the 28,000 pound capacity 6 17.5's will give you. Running them at the lowest recommended pressure of 90 psi will still give 22K of load capacity.