well, having been know to fab a few things, I was REAL skeptical of Christo's from the price. However, Let me say this. On a one-off production on a mill, it would easily cost in time and materials what he charges retail, and it is stout as hell. My carrier is pretty hefty, and I mount my tires high for departure. The hinge is so stout, that it makes the frame flex through the bumper.
IF, you are using thinwall tubing, then go the trailer axle route. If not, get that big thing from Christo.