Been getting stuck in mud many, many times over. Bring help, and a winch.
Not sure about other console versions but the pc versions headlights are client side only, I'd like to see them visible to everyone.
As well as having the terrain if cut up by Player 1's vehicle in multiplayer, effecting another Player 2's passage in his vehicle. I.e. player 1 can make mistakes and be buried to his axle but player two can currently traverse the passage as it is seemingly untouched by another player.