Ok so I tried searching for this in the search bar but didnt find any hits so if this is a repost I am sorry and I didnt find it.
Ok here comes the exploit:
We warlocks have a spell caleld Curse of Doom wich u can not cast on any pvp players or vehicles. But! Ir ecently found out that if you cast the spell [Curse of Doom] on the Vehicle in strand of achient when there isnt a player in it, it works, so just hit it with COD before someone jumps in it, an du got some nice extra damage in 1 minute.
This is specially nice to do when u start defending the castle cause then u just kill all the vehicles before opposite faction comes to destroy you, and put curse of doom on the ones you didnt have time to destroy.
I find this really great. Hope it helps for you too.
So long things short: it is not possible to cast curse of doom on a vehicle with a player in but as long as there is no player, fire at will =)