Are you suffering from a damp, smelly mattresse!

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Does this sound familiar??

Weather here was warm. Low 56 °F , high 93 °F , dew point 54 °F, avg humidity 50%. We had a couple small thunder showers last night. Only enough for a trace of precipitation. The air was heavy and moist this morning.
Ours is the large Campinglab. It is a metal skinned base.
The moisture was on the bottom side of the mattress and top side of the floor. Under side was dry, cover dry, everything else dry. Total amount was probably less than a cup beaded across the mattress mostly near the hinge point.
I think it must have been the warm bodies above and the moist air below?

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This morning, for the 2nd time in about a month, I noticed when closing my RTT that condensation had built up under the mattress. It was a little wet and when lifting it I could water on the tent's floor.
Last month the nights were cold, temperature went as low as 2 celcius. 
This week-end the temperature was around 18 celcius but it was very humid outside and it rained non stop for 5 hours yesterday morning.
I bought the tent last winter and used it only 3 or 4 times, I didn't think of checking for humidity under the mattress until I saw it by fluke last month.
So I'm wondering, is it normal to have condensation under the mattress and if so, how can I stop/reduce it. There was no condensation on the walls or the poles.

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We are Have a solution to this problem!

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Why Condensation?
Plain and simple, a differential between the inside and outside temperature can cause condensation. A favorite place for condensation is under mattresses, bunk pads and cushions. Ask any boater and many RTT owners and they'll tell you stories of damage caused by condensation.

I understand that condensation is common under mattresses due to temperature differences. But why is it a favorite place? Is it because the mattress isn't breathable and it holds moisture in the foam?

A Simple Solution 
We have teamed up with one of the UK's biggest matting fabricators, to trial test and find a solution to this problem. And have come up with the perfect solution. A premium grade PVC made to measure matt. It has a unique lattice effect which allows air to circulate beneath the mattress, creating an air gap which in turn will eliminating the problems of condensation.  It is lightweight, hard wearing and very robust, as well as being extremely flexible and thin, in fact its thin enough to allow it be folded within your roof tent. So once in place, it can be left there permanently to do its job, saving you hundreds of pounds in replacement Mattresses, and worse still damaged flooring.  

Why does this matting work? The unique open grid lattice pattern allows for excellent ventilation.  Creating an air gap allowing the mattress to breath and  the vapour to escape? 

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