I've neve used a racking system or net. I just get a tow chain out of my tool box and lay it across the nose, tail, maybe the wing. I usually hook one of the end hooks around the gear. Works great. I have driven 85MPH on the interstate for 20 minutes on end before with no problems. A 10' chain will restrain two .40 size aircraft. It works by making the plane too heavy to fly out of the bed, yet doesn't harm your plane. You could also just wrap it around the landing gear, and I'm sure that would be sufficient too. Cheap and easy!