I have the same trailer as Lynnmor, 2 years older and have found no major issues. Can I find some of the same issues as his? Probably but they have not given me problems. Example the large knot hole in the dinette frame, very common in the lumber used by most manufacturers, never a problem for us, we are not heavy people. A large couple it could be a large problem. The wheel flex is also very common across brands and yes I have it. My tires wear even and you will only see that kind of flex after a hard turn & it will straighten out when you pull forward.
Lynnmor by the very nature of his profession(the same as my father and grandfather)is obviously a very precise and particular individual. I know finding flaws in design and redesigning it in a better manner was a passion and hobby of my dad. It looks like it may be for Lynnmor as well and that certainly doesn't make him a nut.
Every manufacturer puts out a few problem trailers and Lynnmor may have well bought "the one". With that said, if KZ implemented all his improvements no one would buy it because of the cost. I would buy one of his "corrected" trailers when he was done with it in a flash.
I think KZ makes a great trailer, I'm on my second. I also think most of their dealers are great as well. I don't think Lynnmor's dealer seemed to be up to the normal KZ standard.