I have the same problem. The weight on the nose is more than the legal limit.
As you can see I tow a double axle Sensation Maia and I do not have this heavy nose weight. To be honest the nose weight of my van can be regulated by how much I pack in the frontend of the caravan. How I came to know this is when I fetched my Maia from Sensation nothing was loaded in the van. I used the mover to bring the caravan out from display area of the factory. It has a rather steep down slope just as the glass doors.
The jockey wheel lifted of the ground as it passed over the doorline and stayed there until I slowly pushed the front axle over the doorline then only did it drop slowly as the van moved forward.
I even found that when reversing the Maia from my drive way the jockey tends to lift a wee bit as the two axles pass through the ditch where the tar and pavement meets. Again with nothing loaded in the front of the van.
Now with the spare wheel and either the Rally or full tent there is enough weight that alows for a stable tow.
So with without anything packed in my van it will run balanced only on the two main axles.