OMG... there are no coincidences! I was just talking to a bunch of FTers re this exact kind of thing - and I do mean exact!
If you post "extra cot (and, gee, who wouldn't want THAT!)available in Cancun for spring break" I guarantee you that you are going to get the demographic you want. I cannot imagine that any self-respecting FTer over 29 - or under for that matter - will admit in public to wanting to share a cot/sofa. Why? When we can Priceline a Hyatt, get miles for a local phone call and nights toward diamond status?
What you cannot seem to grasp is that if you post that type of event the responses will be what you are looking for. You do not need to mention a specific age or style. That will always get comments. Always.
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Just trying to keep up with the gals in the trailer park next door.