This is a 5 mm sheet metal ramp, used when trucks get on it. The ramp is reinforced inside with a 5 mm sheet arranged in a comb shape, to be able to take on large loads. The ramp was fisicali built in my workshop and tested.
IAM (Autodesk Inventor, filesize: 175 KB), STP (STEP, filesize: 198 KB), IGE (IGES, filesize: 370 KB)