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
Not bashing these tires cause I have no personal experience with them, but wondering why not just go with LT tires which are readily available and tested to a higher standard than ST tires? Cost is approximately the same and wear should be better.