I used PVC pipe under the runners of my 2x6 skids, and they worked pretty good but I ended up putting on skis in the long run because I wanted more flotation in the heavy snow.
Here's how I mad them: I used 2.5" PVC pipe and used my table say to rip off about 1/3 of the pipe. The on the ends that needed to be bent I used my Dreamily with a cutoff wheel and but the last foot or so down to about 1/3 the original thickness. I then took a robber mallet and gently pounded the pipe over the 2x6 runners.
On the ends where I needed to bend it I used a propane torch and
very gently heated up the pipe and bent it in the radius of the runner.
I secured the PVC pipe to the runners with Sheetrock screws up near the top where they wouldn't show.
They really did work quite well, but me being one to always try to build a better mousetrap replaced them with downhill skis You can usually pick them up very cheap at a garage sale.
Here's a picture of my shanty, but not a very good picture to show the runners clearly.
http://img.photobucket.com/albums/v693/Bassman4940/b5a12c67.jpg
