Keeping your cool with a Camper Trailer

For those with CT's, saw a great idea at our local outdoors shop,while travelling home from work today.They had a camper out the front all set up on display, but what caught my eye was the new "Tropical Roof" set up it had.
There is a company making tropical roofs, made to measure out of a similar material to that of what those sunshades are made from that go on the windscreen of the car. The shiny silver stuff.
I walked inside and put the back of my hand on the roof to feel the heat, and to my surprise there was bugger all. The tropical roof was actually laying directly onto the canvas as well, so it might even work better with some sort of a gap, like we used to have on ours when we had the big silver tarp over it on hot days.
Just thought it might be of some use to someone, here on the forum, as I hadn't yet seen this done anywhere else yet.

cheers Unc.