I run Continental TerrainContact A/T on the 20s and have good and bad-roaded extensively in them. My picture is on them after a 85 mile one-way 4x4 road in Utah: Amazing tire in all conditions, but I couldn't air them down enough for crawling obviously. But I did a ton of sandstone light slab climbing, babyheads, and it does great. Off-road I run the RG on 17s and they are incredible tires for everything but snow and mileage.