Need to replace tires on my 38' fifthwheel that weighs 18,000 lbs Tires that came with rig are five ply I got a great deal on 12 ply tires Any reason for not upgrading to 12 ply tires?
I don't believe that radial tires actually would have 14, 10, or even 8 "plies". Plies have pretty much not been a real thing since bias ply tires bit the dust mostly. IMO it is probably more important to go by weight and carrying capacity. But that's JMO.