Been playing multi with buddy the whole game. Fist of all if it shows under your in game profile, as well as vehicles and upgrade unlock should somehow link your single player to say have them. Honestly i love the game but im prob not going to play it twice thru just to unlock what i should already have gotten by playing online. Trailer in Michigan is glitched up in there air holding our progression, we go to restart the mission it won't reset the trailer because says object in the way when there isn't.