I looked at exporting a vehicle from Canada to Libya. Loading/packing/shipping costs varied between $4000 - $7000. I could never get a final word on duty, but what you wrote is about right. Overall, I got the impression that it would be better to buy in Tripoli.
Also, worth pointing out is that the North American model of a vehicle is often different than the African model. The parts for a North American Toyota Hilux and the African versions are different. I had a friend take a Toyota Corolla to South Korea, when his car got broken into, he had to order new glass from the USA.