Took a break from working on Sally and started building a bobsled or my smitty on roids. LOL It's based on the design of an old horse drawn sled; that the loggers used back in the day.
The front & rear skies will turn via a set of pivots below the deck. The cross chains you see in the schematic; makes for front & rear steering. As you would turn to the right, the front skies follow right; but rear skies would turn out left. Allowing both sets of skies to follow the same arch and not be dragged sideways on a sharp turn. I've got the ski and ski frame welded up and the 5X8 foot deck frame. Still need to install the turntables (pivoits) and the draw bar. Once that's done, I'll get my brother in-law out here to build the wooden enclosure, on top of the deck frame.
This last pic shows the approx position of the turn tables. Two plates for each set of skies. One plate welded to the ski frame and the other to the deck frame. Then the two plates bolted together, in the center with a single 1 inch (diam) bolt. Also found a 4X8 sheet of 3/4" thick puck board (Kijiji) that I'll cut four 3" strips from and attach them to the bottom of the skies. I know it looks heavy; but with the beating this thing will get; anything lighter (smaller) than 1" tubing would be junk first trip out.
Dan.