I'm kinda surprised nobody's mentioned Moritz. I've got a Moritz 20+5, adjustable dove-tail. When I started looking last fall, I realized the dove tail was a MAJOR factor in my decision. I found that the only 2 brands remotely available in my area that had any sort true fully-adjustable dove-tail were Moritz and Corn Pro. I liked the system that CP offered, a landing jack cranked from the left side under the tail, but what sold me on the Moritz was the slightly higher GVW (14,500), and the fact that the neck is one solid piece for each side, not 3 or 4 per side welded together. It's also a bit taller (the top of the neck rails sit slightly higher than the cab) which is nice because of my bed rails. It's got torsion axles, which are idiot-proof as was already mentioned, and it starts to bounce around 70mph empty. Loaded, I love it - pulls really smooth, no sway, bounce, anything. I'd consider another one with a heavier gvw at some point.