I completed the Delivery Mission challenge last night, which took a few attempts. Those crossings are serious business, and I'm now sure I dislike the C-255; give it any excuse and all it wants to do is excavate wheel-shaped holes. It does have the weight necessary to pull the submerged truck out of the current, but I relied on the C-65111 to get the rest of the job done.
There wasn't much to see in the dark, but it looked like a nifty map so I went back in to explore with the A-469. It was simple enough to winch the utility trailer on its side, winch the A-469 onto its wheels, fuel it up, and fix the damage from the spill.
The A-469 made it through the first crossing okay, and then I climbed up the slope, scrambling over the rock and into the woods. The top of the second river was a little more exciting, so I tethered myself to a tree just in case:
The woods were pretty tight from here on, enough so that I carried a souvenir for a little while.
I made it to the vista point I was after, to take a screenshot of the challenge route down on the shore:
The next crossing was doubtful, but I wanted to see if I could make it up the hill on the other side.
Needless to say...it didn't work out.
I might try again starting from the shore near the destination. It's a cool map to do four-wheeling.