No room for a boat with your 5th wheel attached? Here's the solution!
I purchased this rack from a gentleman who used it on his Ram 3500. It is bolted/welded aluminum 1 1/2" stock. It works with a front receiver and suspends over the cab and attaches to your headache rack. The last picture is an example of what it looks like but not the actual rack.
It's 52" wide by 150" long and the bar that holds up the front end is 68" long.
This rack does not include the headache rack. Thanks for looking!