The parts list for my 1998 8KCAB states 600-6, 4 Ply tires. I currently have 600-6 tires, one is 8 Ply, the other is 6 Ply (from previous owner). Should I stick with the 4 Ply as stated in the Parts List, or is there any benefit in a 6 or even 8-Ply for a '98 8KCAB? Thank you.
-Ryan