Is a twin too wide? I bought a folding (for storage) king size bed with 17 “ of space underneath it. It breaks into two twins. I loved the amount of space I had underneath. One of these would allow you to hide large boxes under it. They came I various heights. Like this: https://www.amazon.com/AmazonBasics-Foldable-Platform-Tool-Free-Under-Bed/dp/B07R6TND49/