The product is well made, the assembly instructions suck, it's build by looking at the picture.  Some steps don't show up on the pictures, you kind of have to figure them out. On the bottom of the top trundle frame 3 bolts stick past the nut, if you tighten them past the nut, which I did.
The middle bolt caught the brand new mattress & tore it, when I pushed the bottom frame in.