My JD1025R has Carlisle Tires. Fronts are 18x8.50 x 10 4 ply turf tires. As the tractor has a front end loader with 4in1 bucket I would like to use 6 ply tires. As they seem to be unobtainable in Australia, has anyone used Kenda K513 tires? The OD of the Carlisles are 18", the Kenda's are...