Hello, anyone have any experience with the carlisle xtra grip or the tract cheif. Need to replace my titan r4 that are starting to split on sidewalls and have started to leak ballast. Really hard to find tires in the northeast and I can get these for a reasonable price. Looking to replace the rears with the xtra grip and the fronts with the trac chief both in 8 ply instead of the 6 the machine came with. these are going on a L4740 HSTC. Anyone have any thoughts. thanks Mike