Great Product. Some reviewers mentioned how thin the metal is. It is thin. I just bought 3 pieces 1-inch flat steel to use with it. welded them to the trailer. One beneath back of toolbox, one beneath front and one beneath the center of it. Then I drilled holes thru the bottom of the box and thru the flat steel pieces. Lastly, I put bolts thru the holes and added locknuts. NOTE: The reason for the flat steel in the center was to give support when chains and such are placed inside the toolbox.