The biggest mistake buyers make is measuring only the bed frame itself. You must account for the .

These feature a mechanism that allows the lower mattress to rise to the same height as the main bed, creating a larger, unified sleeping surface (often mimicking a King-size bed).

High-pile rugs can jam the wheels of a trundle. If you have thick carpeting, look for a model with large, sturdy casters or consider a thin rug. 3. The Mattress Factor

These remain low to the ground. They are excellent for children’s sleepovers but can be a bit difficult for older guests to get in and out of. 2. Measuring Your Space