Upgrading Entitlement For Trailers
In general, an additional driving test is required for each category or subcategory of entitlement. But there are certain exceptions to this where drivers have already passed one test which involves trailer entitlement for a larger or equivalent sized vehicle.
This means that passing a test for subcategory C1+E or D1+E upgrades category B entitlement to B+E.
A test pass for subcategory C1+E upgrades subcategory D1, if held, to D1+E. But a test pass for subcategory D1+E does not upgrade subcategory C1 to C1+E because the trailer size required for a subcategory D1+E test is smaller than that required for a subcategory C1+E test.
Passing a test for category C+E upgrades category B entitlement to B+E and also confers entitlement to subcategory C1 and C1+E and, if category D or subcategory D1 is held, these are upgraded to category D+E or subcategory D1+E.
A test passed for category D+E upgrades category B and subcategory D1 to category B+E and subcategory D1+E respectively. But it does not upgrade category C or subcategory C1 entitlements because the trailer size required for a category D+E test is smaller than that required for a category C+E or subcategory C1+E test.
