Will add a bit of extra weight to your rack, but because this drawer is very sturdy! Easy to mount because you don't have to worry about back bolts (some of these will drive you crazy with variable depth of rack). It feels like the 4 bolts in the front can hold enough the weight of the drawer and what you'll put inside.
I actually got my rack a little bit bigger so I could put this and use it as storage space, very happy with this product