Thank you!
Yes, each joint swivels. I have a wood "bearing" in the first joint where it attaches to the mainframe, to take up the space inside the square tubing.

That is the same trailer I built shown earlier in this thread, modified for this set-up. I shortened and centered the hitch portion, and the deck. I had a problem with cornering with the trailer at speeds above 10mph(16kph) with the long tongue, wanted to flip if the trailer hit any sort of a bump. Tacoed a couple of wheels from the extreme side loading when that happened. can take corners at 18mph(29kph) now before the inside wheel wants to leave the ground. I figured out that I didn't need a 5 foot (1.5 metre) long deck for the loads I carried.

That little homebuilt pulls like a dream now! Is also so much easier to maneuver in close quarters, and stores in the garage easier too.

I will be building another trailer soon, with adjustable length for hauling long lumber, similar to the BAW idea. Front section will separate from the wheel section when loaded, and the wheels placed near the balance point of the load. The lumber would be tied securely to both sections making the lumber itself become the body of the trailer. When not loaded the sections will be connected with these.