Abstract: A tool for inspecting a trailer kingpin and adjusting a fifth wheel hitch includes a plate having at least two mutually substantially perpendicular sides, one side having upper and lower generally rectangular tabs extending therefrom and separated by a space therebetween, the space being dimensioned to snugly receive a kingpin lower flange, the upper tab being dimensioned to be snugly received along a kingpin shank. Opposing this tabbed side is a side having at least one shaped recess for receiving a means for adjusting play in a fifth wheel hitch and transferring the application of torque thereto. The plate also includes a shaped aperture for receiving a kingpin, the shaped aperture having a substantially rectangular wide portion and a substantially rectangular narrow portion.