I doubt that that Tire warranty will pay out for you unless something odd happens and you completely shred 2 or more tires which is rather unlikely even on the rough roads you are anticipating driving on.
Here is what I believe to be the best advice I can give with all of that:
Don't buy any of the warranties. This segmenting different aspects is silly and potentially a pain. Put that $10,000.00 aside for possible repairs.
I guarantee you that having a cash slush fund for repairs will be easier to access than some extended warranty if you get VERY unlucky and break down in the middle of nowhere hoping that the only repair shop around will honor whichever particular warranty might hopefully cover the repairs.
Just don't do it man. the peace of mind they are selling you is likely not as great as you would think.