Frizzy, as always, thanks fir the info! Also a great big Thank-you fir that link. From that link I followed another link, that took me here
https://www.tinkercad.com/users/ijdXrBIYp5t-adrian202gt
There is a plethora of other 3D print parts there for this model.
Those lil tools are even cooler looking in person then they are looking at them on the website.
I'll be ordering some brass round stock that'll perfectly nest inside the brass tube. Strength in this project is crucial. I'll be assembling the headache rack that the trailer will rest on while it's stowed upon the trucks back. If it fails, the trailer will fall off. Falling off, ESPECIALLY under power, could potentially damage the truck AND/OR the trailer. I'd rather do it right the first time, then redo it, PLUS R+R damages.