Late post, but im doing it for the archives and google searchers. I have looked at every corner of the internet and spent 2 weeks nonstop looking at daybeds for my guest room. Birch Lane (higher end brand of Wayfair) is the ONLY strong solid wood day bed I found w trundle (unless you spend $$$$ w an Amish store). The SKU is CDCH1056. It's weight capacity is something like 700 lbs for the bed and 300 lbs for the trundle. Pricey at around $8-900 but again, it's the only bed you can find online boasting that weight capacity. Everything else is flimsy fake wood. I also liked that the bed can take 10" thick mattresses while the other flimsy daybeds only took 8". Good luck More on reddit.com

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It exists. Search for a twin to king (two twins together is a king) pop up trundle. More on reddit.com

Have you heard of AFI Furnishings? They have several options for daybeds and trundle beds. Also check out the Murphy Bed Chest, which is a comfy sleep option for guests and an elegant chest when folded up. https://afi-furnishings.sjv.io/oq6YeO More on reddit.com