Went to our Triton 430 last weak which is parked in the garden under a AL winter cover in full sun. When I unzipped the door the heat that came out between van bodie and cover was so hot I could barely touch the van , it appears the green material is absorbing the Suns heat and transferring to the van .I have now taken the cover off and the van is cool to the touch .

"winter" cover on in a heatwave, guess it would get hot, ours is a light grey color, from protec I think