trailer couplers

Need some parts. I have a MARVEL 2" A frame coupler on my utility trailer. I think it is worn out. Had it come off the ball and the coupler smacked my tailgate a couple times.... (came off 3 times total, no new dents the 3rd time) Lever fastened, and padlocked.... had a matching 2" ball, but the ball is a but rusty. the last time was going a whole 15mph, on freshly laid gravel.
Coupler is welded, so I really don't wanna cut it off so I can replace.... would rather just find new guts for it, if possible. Yeah I searched (well via Bing anyway) and came up empty on this brand. Found 1 "hit" and that company was out of stock. I think this is an old company, could they be defunct? I'm looking for the coupler guts.
I know I didn't have my load centered ideally, but that's because the deck on the Kubota I was moving, is too wide to go between the fenders// so I had to
carry it farther back, than I'd have liked to....didn't mind having to go slow, didn't bother me. I made it back to where I picked up the tractor (my son's house) after I did what I needed, without issue. tractor didn't budge on trailer deck, even when "nose up". good thing for tie straps.
My son +me are ~400 lb combined, we both had to get on the tongue, and were able to pull it back onto the ball each time. I only went about 8 miles on back country roads (minimal traffic) 16 miles total there + back.
not only that, but I blew up one of my Ariens tractors as well..... got it well used, no idea of # hours. Had a Kohler KT19 series 1. (which are known not to like side hills like ditches, I had those done and had made about a dozen laps on dead flat ground. I'd mowed those same ditches with that same machine, a handful of times over the past year...... no "BANG," just a bunch of oil smoke, once windowed..... I have an 18hp Magnum that I can slap on there/ but not sure if I want to...... that engine is destined for a spare for my other Ariens GT19, that has power steering and is my snow blower tractor. wonder if I could fit a /6 on that frame haha.....

In reading your post what could possibly go wrong? Your probably lucky that the trailer didn’t come completely loose and kill or injured anyone. I’ve been towing trailers for 40 years and one time I failed to put enough tongue weight on the hitch. We were coming down a big hill and the trailer started to fishtail. It was so bad that I could see across the complete back of the deck lid and luckily I got it stopped without wrecking. We moved the car forward and continued our trip but later I found out that both rear springs had broken leafs.