How to unlock
Complete particular objective by using Type B-130 only
Best way to do it is on the map Coast. The best way is to take the Type B-130 with the Carriage and the Carriage Trailer. Drive down South and unlock the Type C-4320 Truck. From there load 2 small logs onto the Type B-130. After that hop into the Type C-4320 and winch to the Type B-130 and just drive forwards the objective that's located at top West side of the map. Instead of driving into the marker with the Type C-4320 winch the Type B-130 next to the objective and hop into the Type B-130. Drive into the objective and repeat it twice.