He first unloaded and then reloaded the ballista with a new Javelin. He then handed over the control to his father.
Going down the barrels of fuel were already placed in the kitchen by the ladies. When the MCV was handed over to Arther he has requested these ten barrels of fuel from Robert, buying soo much fuel at a time is not possible at any place but with the help of Jack from the black market, they were able to acquire it. In their previous journey, they had used up three barrels for the MCV with six more remainings.
Arther checked the barrels and then went to the driver's cabin, at this time the MCV was driving through the forest around the warehouse, there was an obvious growth of tree and plants. According to the distance Rose has told them they must have been able to reach there till now, but due to taking a detour and the bad road condition, it was taking more time.