I'm a Nebraskan, and rode the trail from O'Neil to Norfolk last year.
I'd say your marathons will hold up for sure. I didn't encounter any goatheads,
but not saying there isn't any.
Kansas is a notorious state for those damn things. When I lived down there, I
only had a few flats on thousands of miles of riding my Scwalbe Marathon Plus
tires through goathead country.
Just bring extra tubes, you'll be good. Have fun!!!
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