Falken uses cheap steel plies. Other manufacturers use high tensile steel plies. Thus the weight difference.I think RT is code for the latest reason they would like us tripping over ourselves to ‘Replace Tires’. All kidding aside, it’s just an updated version of the Duratrac tire. I have them, and also too little experience with them to judge their relative value. I agree with Teck, Falken offers more…tire. That additional tire mass might be steel, rubber, polyester, or all three - I don’t know. My prior LT tires offered more mass too. Horses for courses I suppose, and plenty of folks love those horses for honest reasons I’m certain.