First time I have used the ANTS site to sell a vehicle, in this case our caravan.
It is fairly straightforward except at the end where it asks for the kilometrage of the vehicle, which is compulsory to complete.
There is no other section (that I can see) for a caravan as opposed to a car.  All the other documentation seems identical for either car/caravan.

Has anyone come across this requirement and what to put?

Thanks