Twin Beds with Trundle Design.
Measure the size of your mattress. Attach grooves for the boxes on the cross section pieces. Put the mattress on top of the bed.

Twin Beds With Trundle Brown

Twin Beds With Trundle DIY

Twin Beds With Trundle Low

Twin Beds With Trundle Nice

Twin Beds With Trundle Set

Twin Beds With Trundle Storage

Twin Beds With Trundle White

Twin Beds With Trundle Wonderful