Just for info I ordered set SAILUN 637 G load tires for friend and this size is almost identical in diameter size of the GOODYEAR 614. 30.7 inches so good option to consider
Been using these tires since Apr 2013, not the first problem. I was at a RV show in Florida and found that some new 5th wheels are coming from the manufacture with the Sailun S637 on. They are starting to see the light.