A friend of mine modified his Flex Air hitch to make it easier to air up/down from outside the truck. I did mine a bit different as I have a dually and wanted to reach the air chuck
I used 1/4 galvanized steel pipe and added a Husky air gauge. Also, I used double faced automotive tape to secure 1/4 trim wood, then pipe straps to secure the pipe. This avoided drilling into the pin box.