>  First, you can add
> a 'heat shield' like in this picture
> <http://picasaweb.google.com/starwagen/TableMountain2009#5363627421038372466>
>
> That's my rig when set up for a week long stay under hot Sun.

Loren has another additive in the picture--the gizmo that lets the
rear hatch stay open a little but securely locked.  Steve at
Eurocampers.com has them.  $28.  LiMBO has another kind.

When away from the camper in hot weather, leaving the rear hatch
cracked with the screen in place can make a big difference in how
much air moves through.  Think hiking around Moab in the summer.
That's what I'm thinking about right now....  ;-)

Richard