Ok comments about Mitchlin and Toyo other than price.
Most all tires now days are made out of much the same stuff. oh there may be minor differences in the formulation but nothing earth shattering.
I have often heard that Mitchlines do show signs of cracking or more precisely crazing (very low level cracking) but this is not indicative in most cases if imminate tire failure. I am also told they have great tread life.. But read on.
Toyo's for example at over 1,000 less installed. Well the tread life is not as good if you are driving a SEMI. but if you are driving an RV.. odds are you do not drive 8 hours a day 6 days a week and thus wont wear the tread out over a period of 10 years.. and you should have already replaced either brand 10 years from now.
So save your money.