Abstract: A system including a first support having a leg member, a bracket operably coupled to the leg member, a first pad coupled to the leg member, and a support member coupled to at least one of the leg member or the first pad. A second support has an arm member rotatably coupled to the support member, an extendable strut coupled to the arm member, a brace coupled to the extendable strut, and a second pad coupled to the brace. A knock-over-center clamp operably couples to the first support and the second support and moves the second support between a clamped state and an open state.