This one works great for us in the overhead bunk over the driving area of our Axis 24.2
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1.
It fits within an inch +/- on a twin bed. It requires 110v for the pump but that is not an issue with our inverter. My wife starts with it pump up pretty high then adjusts for comfort by removing air.
Deflated, it leaves enough room in the bed for bedding before it is cranked up in the stowed position.
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