Beautiful picture, Randy! Maybe a little extra drag from deeper fins would be a benefit when going downhill.
I finished modifying an Emsco Beast sled with my front grommets to attach the poles, and a single aluminum angle runner on the bottom in the center at the rear of the sled. It worked really well going around corners on the trail and on some side hills. It pulled very easily, especially on packed trails.
I've found that crossed poles work best for trails with sharp corners, and help a little to keep the sled from rolling on side hills. But coming down a really steep slope on Mt. Hood, the sled would swing around to one side or the other using crossed poles. The sled would then turn over UPHILL and stop.
My arrangement allows you to attach both poles to the center of your back. I switched to this arrangement and the sled stayed behind me coming down Mt. Hood from then on. You can also turn and look behind you without affecting the sled. Since you can rotate your hips, it's easier to walk (or skate ski). I found that rotating hips while walking smoothed out the motion so the poles didn't hit my back with each step.
So I'm a big fan of poles in the center, except on tight trails with curves. There's a good reason why all trailers have a single hitch point.







