Good morning everyone. I have purchased a 2014 International Prostar to pull my Cyclone toy hauler. I am using a RV 5th wheel plate bolted to the frame for my hitch. I would like to build a bed for carrying my golf cart and other things, but I am having trouble coming up with plans for the structure. I would like to build something similar to a Herrin bed. I was a professional welder for 15 years and understand how things are supposed to work but I am not too hot on design. I am also having trouble figuring out how the bed will clear the wheels when the air goes out of the air bags when the truck sits for a long period of time. I have attached a few images that I have found and what I am looking to accomplish. Any advice, pictures of bare frames would be greatly appreciated.