Hi JTCWelcome to the forum.
I too have a vx detachable towbar and as far as I am aware my van tows level. Most towcar/caravan combinations tend to tow nose down due to the van nose weight, unless they have rear spring assistance, or they are fitted with self leveling suspension.
Is your Antara an SE as this has a self levelling system?
There are plenty of caravaners on here so some one will probably be able to offer help.