As stated by snoking the Sailun 637s are a great choice. No reports of any problems with them and everyone seems to be very happy with them. If money is no object then yes the Goodyear G614s are also great. We are replacing our units oem tires with Sailun 637s before our next trip. When ordering we had to order from a truck trailer tire shop as the Sailun 637s are a heavy duty trailer tire used for commercial use as well as on RV'S. Price up here in Canada for the 4 of them is under $900 balanced and installed out the door, half the price of the Goodyears.