The "lead car" drives right into the river without pausing and gets mired in the river bed, while the "rest of the caravan" is able to easily cross the river just to the right of the unmovable vehicle. This is an obvious setup to demonstrate the capability of another Dodge truck and its winch to extract stuck truck.
When the "lead car" gets mired in the river bed and the "rest of the caravan" continues across the river, there is a cut to two crocodiles entering the water. This is obviously an inserted, unrelated clip as the water's edge where the crocs enter is unlike anything near the river where the trucks are crossing.