Just converted a Renault master into a campervan, dvla will not register it as a campervan because it still looks like a mini bus from the outside even though I’ve got tinted rear windows, curtains , external elec hookup and skylight fitted, they gave me a letter to be carried at all times with the log book in case I get stopped, when first thought of converting I rang them and they said once work is done, send relevant photos and they will change the details on the log book, this has turned into a bit of a nightmare, any suggestions?