I purchased this bed with the trundle for the grandkids since I didnt want bunk beds. What I didnt like was the width between the slats and the issues of breakage reported in the reviews. I looked into buying bunkie boards to place on the slats but that would of been too think for the trundle, so I added pieces of finished plywood on top of the slats.
After researching what material to buy I went to the local big box hardware store and had them cut 1/2 inch thick finished plywood to 38 by 75 for the top and 38 by 74 for the trundle. Worked perfect as a platform plus there has been no issues with any breakage. I believe if you want to use plywood on a full bed it has to be thicker than 1/2, also I bought the ready to paint or stain plywood so the finish would not be rough and I didnt need to sand it.
Slat solution
I purchased this bed with the trundle for the grandkids since I didnt want bunk beds. What I didnt like was the width between the slats and the issues of breakage reported in the reviews. I looked into buying bunkie boards to place on the slats but that would of been too think for the trundle, so I added pieces of finished plywood on top of the slats. After researching what material to buy I went to the local big box hardware store and had them cut 1/2 inch thick finished plywood to 38 by 75 for the top and 38 by 74 for the trundle. Worked perfect as a platform plus there has been no issues with any breakage. I believe if you want to use plywood on a full bed it has to be thicker than 1/2, also I bought the ready to paint or stain plywood so the finish would not be rough and I didnt need to sand it.