the ply rating depends on what size you get
the company i work for sells Toyo's and we do not sell these too often because there is no real offroad scene here but to few we have we get great reports. Most of it is in regards to on road and sand/beach use (though its not the best sand tire). I am sure you guys will put a tire through some very different paces than people here though.
Other than that all i can say is Toyo is a damn good tire, i run the OPAT's on my D40 and cant say enough good about them (again road use, some beach and the occasional "lets go looking for a shallow swamp" kinda use)