Took an otter tub added water skis on bottom using 4 inch tubular aluminum 6 inches long. To get bottom of sled up off snow. Added a bar in back for pushing instead of pulling.
All the experts on sleds said I should have used snow skis. But the wooden water skis ride higher in the snow. The experts argued for pulling also. All I know is what my 70 year old back and lungs tell me.
On a recent trip went with a fairly fit 30 something fella. He remarked I seemed to be in better shape than he. As he was calling for the rest breaks on our jaunt across the lake. Let him push my sled for a bit. He is now building one identical to mine. On pure ice no resistance whatever. On snow covered ice very little even though is loaded.