Another reason why myswaggers is so awesome folks...
Until reading this thread it never occurred to me that moisture would get under my mattress ... So far we have been out in our van only a few times... but on a couple of those occasions we have had overnight condensation all over the walls!! ... no doubt also under the mattress as well...
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If you have smooth surfaces on the interior of your Van, moisture will gather while you sleep. It's like breathing on a window.
The warmer the interior of the van, the longer it takes for the moisture to gather, but it still will/does.
One way to minimize this, with hard bodied vans, is lining the inside with material that looks like polar fleece.
It's not quite as simple with swags or campers with canvas tentage.
You have to have good venting, but it doesn't cure it, it reduces it.
And, of course, the more occupants of the tent/camper, the more moisture.
It's that simple.