We've been planning a trip for about a year and have watched a lot of videos and read a lot of forums discussing the issue of airflow around and under the beds. We have a FC 28 Twin, and I wanted to address 2 things I didn't like about the twins.
1. The width of the bed platform is too small to support the mattresses. This was an easy fix, just cut some nice plywood to the curvature of the wall, and add a couple of inches to the total width, such that it supports the mattress further out so I'm not rolling out of bed.
In keeping with our goal of never adversely making changes that can't be undone leaving no trace. We like original things, because we believe that one day, someone may want to buy our AS and hope that it's unscathed. The base board is velcro'd down in four places. It doesn't move at all and zero drilling, or cutting of the original platform.
2. To address the airflow. After looking at all the suggested solutions, I felt they were either way too expensive, ie Froli or the spun fiber mesh systems. My solution was to purchase a pack of 24 interlocking, flexible plastic shower/bath mats, that raised the surface aboout 3/16s above a floor to allow water drainage. I surmised that if it can allow water to drain off, it can certainly also provide enough airflow to prevent condensation buildup and mold/mildew under the mattresses.
My only mistake was under estimating the number of squares I'd need. I bought a pack of 24 from Amazon, at $25, but they've since raised the price of that to almost $50. I used 20 tiles. So if you're thinking of trying it, order at least 40 for twins. I'm sure a Queen would be slightly less. Still exponentially cheaper alternative to the other options. I'm going to try to include the pictures I took, but here is the link to the shower squares.
The tiles lay nice and flat. To make it stay where it's supposed to, I used 1/2 screws from home depot (in a picture) and they worked great. I would cut a spike off where it would naturally insert into another tile, and would screw into the receiving section..perfect fit and you just screw it down enough to where the screw head doesn't project. There was some cutting, done with a cheap scissors, and I used a utility knife to cut the spikes where needed. I did one twin in about 45 minutes. Easy peasy.
https://www.amazon.com/Interlocking-.../dp/B086SN9H99
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