Here are some from Etrailer that I think you could drill and put a rod thru like you were planning for your steel ramps.
https://www.etrailer.com/Car-Ramps/Stallion/288-07502.html
These ramps were setup similar to what you were talking about doing. I could slide them in or out depending on the width of what I was loading onto the trailer.
They'd used a piece of pipe that the ramps slide on.
https://www.etrailer.com/Car-Ramps/Stallion/288-07502.html
These ramps were setup similar to what you were talking about doing. I could slide them in or out depending on the width of what I was loading onto the trailer.
They'd used a piece of pipe that the ramps slide on.