Hi
We had issues with nose weight with our previous caravan. Have a look at what you have inside the van under the front seats, top front lockers, the drawer unit between the 2 front seats, in the front locker by the gas bottles, also when towing do you have any equipment etc between the front seats. Its surprising how much the hook up cable, awning pegs, books, kids toys etc weigh. Our hook up cable even now either travels in the back of the car or near the axile as does the bucket of awning pegs (we carry pegs for both grass and hard standing).
Hope this helps, good luck
Annette