You can now grab Supplement 5-6: Vehicle Handbook from Drivethru as a PDF. This is a central 'core' supplement for Traveller that is set to be used for all vehicle related matters in future publications, and contains a complete design system that will allow you to create pretty much any vehicle you can imagine (and give you plenty of ideas for vehicles you can't!).
You can grab it at;
http://rpg.drivethrustuff.com/product_info.php?products_id=99973
You can grab it at;
http://rpg.drivethrustuff.com/product_info.php?products_id=99973
