we don't care either way. but honestly, the class is called "true 10.5". 315 and 325 d/r's are NOT true 29.5X10.5 tires. rules say "may be measured". i say, if d/r's are allowed, the name of the class should be changed to "limited street" or something, and other tire manufacturers that have "10.5" labeled on the sidewall that are a bit wider than 10.5 inches should be allowed no questions asked (like hoosiers 10.5 slick which is actually 10.8 inches i believe)... and no, i'm not talking about W tires.
it's just my opinion. don't care either way. we already know what tires we're runnin.