[wiredgeorge]

Interestingly, Trailer King RST ST225/75R-15 LRE and Carlisle Radial Trail HD ST225/75R-15 LRE both have M speed ratings (81 mph). I think 81 mph might be pushing it for my old 96 F250 with drum brakes. I always keep it under 65 mph (I am also not a spring chicken with lightening reflexes). The Trailer King is $75.79 a tire (plus add ons) and the Carlisle is $115.99 (both priced at Walmart for comparison). I think a difference would be the Carlisle factory may have more quality oversight from a US based company where Trailer King? Who knows how much quality control oversight? I am not a tire engineer either and since I know squat about such things, read this stuff on this forum and err on the side of safety and use tires recommended by those that seem to make the most sense.