I purchased a motorhome this year it was made from a VW transporter van. It was sold as a camper but i have found it has no insulation and cannot be slept in. The temperature inside is like an oven and it got up to 49 c. The dealers response is tough and try opening a window. I have had it 3 months I had a Maxx Air vent fitted to try to resolve the situation but this hasn't helped and the installer said there is no insulation in the van. What can i do?