Sorry @Forces for the self-plug there, I promise it's the only time I'll do it.
Kind of unrelated, but notice the grass in that last screenshot is flattened even in the middle where the tires weren't touching? Read somewhere that it was caused by something relevant to the overall terrain height I think... Immersion breaking nonetheless...
someone else before (in october) converted the map.... http://www.mudrunnermods.com/blackwater-canyon-map/
EDIT: i am not the only one who needs to be blamed on. also to verify, the workshop mod was friends only.
And if we knew who that "someone else" was, you can bet your ass we'd be griefing on them as well. And your "friends only" argument is invalid. It doesn't matter whether it's public or not, you don't just go pinching other people's mods and republishing them AT ALL unless they say so.