Hi Andrew,
It isn't currently possible to view the classified adverts online. However if you haven't already found a 'van you like in the magazine, you could try looking on Practical Caravan's new sister site www.rightcaravan4u.co.uk. You will find hundreds of different caravans and hopefully one there will take your fancy.
Regards
Tori
Publishing Manager
Practical Caravan.com
CaravanSitefinder.co.uk
RightCaravan4u.co.uk