Well, it appears that there's still some gold left over from the explosion. Lets go get it!" "We're out of fuel, we can't." "Well refuel!" "No, no, Don't forget the rules. 'We only take what one truck carries.'
Good way to make money without advancing levels for a while to let your ship catch up with your level: Go to Baltra and buy sugar, then go to Barbados to sell it. Repeat.