This is a bit of a difficult one to answer. The rules changed in 2018 and only a small amount of converted vans would now qualify to be changed. Essentially, if you are converting a van such as a VW Transporter or Ford Transit Custom and fitting a pop top and full interior conversion, you would not be able to get it reclassified. Pop top roofs do not count towards the "Fixed High Top Roof" requirement in the new rules. You can find the full checklist of DVLA requirements for reclassification to a Motorhome/Campervan on the V5C HERE