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May I suggest you send at least a couple of them off for testing by a certified metals lab? They may not have been up to specifications. Hmmmm.

I'd like to see some SERIOUS ENGINEERING ANALYSIS on the TORQUE MOMENT and DOWNWARD FORCES on the latch mechanism that engages your King Pin with this design concept. Essentially, I see a FULCRUM effect with the pivot point being the leading edge of the trailer's Plate and Chassis. The Pintle...

Another thought would be to simply buy/borrow/use a DOLLY. Hitch the dolly to the Pintle Hook, back the Dolly's Fifth-Wheel under your "new" trailer, connect air and power, and pull away. No fuss. No muss.

Current heavy wrecker designs have an attachment quite similar to your design concept. Here's a GOOGLE IMAGE SEARCH...

That's what I call "Using the right tool for the job." :goodjob: