I have an older 36" Bunton Hydro with a set of 13X5-6 tires on the back with a pretty aggressive chevron (like on heavy equipment) tread. I had a flat last week, and they are getting pretty worn, so it looks like the time for new ones. The previous owner of the mower had an extremely steep site that he mowed - hence the stout tread pattern on the back tires. The lot that I mow is fairly level, but there is one area that gets pretty soft and muddy, especially after a heavy rain. What kind of replacement tire would you all recommend? Would a standard turf-saver tire work OK, or would I be better off with a stud pattern or another chevron pattern? Your input is appreciated! Thanks!