driver who set off a nine-state terror alert when he disappeared with his loaded gasoline tanker may have ditched it after getting involved with a hooker, colleagues and officials told The Post yesterday. "Let's just say he used our vehicle in an unauthorized manner," said Jim Cameron, safety director for the Maspeth, Queens-based Island Transportation Corp. ~snip~ "He just abandoned the truck and never came back," said Cameron. "We haven't seen him. He'll be getting a formal notice that he's been terminated." ~snip~ "They say the guy got hooked up with a hooker and he was too embarrassed to come...