These ratings are based on the trail overall, not just on one or two tough spots.
Rain can increase ratings by one or two points.
Please remember, all vehicles are subject to inspection prior to trail departure. Numerically higher-rated Jamborees are more likely to result in vehicular damage. 1-3 feature trails with obstacles that are easy to navigate. You may encounter a wide variety of challenges, including mud holes, boulders, and stream crossings, on the trail. 8-9 indicate that the likelihood of getting stuck is considerably higher.