I am away now on a really slow internet connection, but something isn't right with your numbers, the maximum permissible per axle adds up to much less than you think as a total??
Our actual maximum gross was less that the added values of both vehicles, I am worries=d you might have read max train weight (including a trailer) your gross weight must not exceed the axle limits
The permissible weights in my post are from the plate in the van.... The max train weight is stated as 6505kg.
Not sure why you think it is wrong?