I found a number of under bed inner tents on the internet. They all seem quite flimsy but I wondered if anybody has experiences of this one and whether it would fit under a Conway Coniston bed? It's got a PVC base, which I presume is stronger than the woven plastic cheapy ones they put on the botton of nylon tents quite often.
The proper ones are much nicer than the usual ebay ones,though pricey. They are branded as Cabanon,but are twice the price of that Blue Diamond one. The Tesco tent sounds ideal.
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As it is within the trailer, as long as the pup tent is strong enough to withstand pulling on it's anchor points it should be OK. I bought one about 6 years ago and it is still going strong, despite being used by 2 teenagers in turns.