My tire dealer tried talking me out of ordering in the 10 ply tires couple years ago. They told me it would be harder ride. I don't really see or feel it. The 18's ride about the same as the 16's do.
For a big truck you would run Higher PSI, Our 18's max out at 90 psi, the 16's are std max out around 60 psi. I was told the higher the ply, the more psi max. Even at running half the max psi, the tires don't wear eneven.
hopefully this opinion helps
goood luck

keep us informed.

I will be moving our 18's to our chevy Avalanche.... making room for the future set to be ordered over the next few months.

chris