Yes, I can easily see the 3" tubing.
What I'm trying to see is how the assembly is mounted to the frame. The frame isn't thick walled, so it has been a challenge for me to think about how to attach something thick and heavy to something thin and light, and still get the performance expected from something thick and heavy.
I had the same challenge on the rear receiver hitch, which I removed and remounted. At first, I purchased the Reese Titan 45013, but when I looked at how thin the rear of the 2500 frame was, and noticed how the Reese sideplates hang in line with the open end of the G channel, rather than the web, I decided to put the 45013 back in the box, and put the original GM hitch back on.
Then, I made some reinforcement brackets to drop into the top side of the bottom flange of the frame, so that the lower frame flange is sandwiched between the upside down "U" hitch bracket and my reinforcement plates. But then I decided that the reinforcement plate was too thick inside the frame, and would create an isolated stress riser at the forward edge of the plate. With the expected cyclical stress concentrated on that pinpointed transition zone between super thick and stiff, to suddenly thin again, I felt that the frame would fail there from fatigue cycling.
So I didn't install that reinforcement, but instead made a smaller, thinner reinforcement plate intended to distribute the cyclical stresses more gradually across a broader area of the frame. Ended up going with that, because at the very least, the frame flange reinforcement plates reduce the mounting hole wallowing failures I've seen in the past. But there is no practical way to test my ideas to address these concerns. It's all guess work on my part... just looking at other failures and noting successes, and attempting to avoid mistakes and copy good ideas.
So, I'm kind of hoping to see your idea! (as far as how you mounted to the front frame)