My Motorhome is 8 years old. Iam considering Firestone FS560, Sumitomo ST 727, and at a much greater cost, Goodyear G670RV. We are retired and are starting to travel off and on about 3 to 4 times a year @ 4000 miles a trip with extended stays from time to time. My hope is to keep the rig for another 3 to 5 years. Thanks for anyone's input or experience on this manner, gpottinger , mblwhdqtrs