Insurance is tricky, especially if you are going to be a Van owner which may or may not be a Campervan.
In fact is it a Campervan?
It needs to have a Cooking, eating and washing facilities (gas & running water) to be a camper.
My Van will have a bed, a table, a chair, a cupboard. So its not a camper. So I can't have Motorhome/Camper insurance.