Hey guys.... I am having to buy a new set of tires already because my trailer was not properly assembled from factory and fenders were rubbing my tires because there was not enuf clearance. Got my trailer all fixed up now and needing tires. Was hoping to find out which tires were better than others? I was looking at my same tire (Carlisle Radial ST 175/80 R13) but have options of 4,6, or 8 ply tires. I know the stronger ply's will generally last longer but....doesn't that also compromise the haul? (Rougher) #beat my boat and trailer to death? Any experience or suggestions will be much appreciated! I know nothing in the tire field.