Several years ago we ran a part of this (just outside of Unity to just outside of Seneca)--Route 5, Section 3. Did it in one day, stock 2008 JKU Sahara (with Rubi take off wheels and tires). No issues--a few areas that felt like you needed to be in a Jeep, but nothing scary. We ran alone. Only issues we had were: 1) one downed tree (take a chain saw), and one forest service crew vehicle blocking a road (they moved it, a bit shocked to see someone else).