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A national park would be crazy with your 4x4. How would you get gas though?
When I was there I don't think it was too expensive, maybe $0.15 more?At Yellowstone they have gas stations... and they are very proud of their gas.
Up here in the Pacific North West we have at least 1 trail that goes for 50 miles (from naches wa. to greenwater wa.) and it ain't no logging road it's a JEEP trail with hill climbs ,water hazards and 4500' elevation -the forest rangers build small bridges and we ride it alot!