Trailex trailers are awesome, but , as you've seen, very expensive. A good galvanized trailer will last many years if properly maintained- mine's over 30 years old and has carried my 16 many miles, but I never dunk it. Had to replace the mast post, though The mast stepper is a nice idea, but if you're able to lift the mast solo, there are other ways- there are a few threads on the forums about that. I am not sure about the cradles with the rotomold boats. I have just rollers on my trailer and I've been OK, even over some pretty bad roads with my 16!
Damn shame, too! I just sold a nice custom-fabbed cat trailer for less than I had wanted just to get it out of the yard!
Dave