Pulling them with the sled, it will keep the shack from snow plowing when weighted down with all my gear. Power auger, minnow bucket, locators, grill, cooler, tipups, 10lbs of lead, propane tank etc., also my sled is getting at the age were alot of bumps and bruises on the bottom of the shack are adding up and before you know it I have a rub hole in the bottom of the sled. $200 to replace it even more if I need to replace the whole shack, seems to make good sense to me, ofcourse they will be custom fit, and relatively easy to remove if I chose to do so and the mounting holes would be filled in with custom made delron plugs..This shack is already a classic, I had to special order the cover for it this year from Frabil! Also I plan on mounting the ski’s from inside the shack and not going through the skis so not to create any additional drag….The other idea I had to protect the bottom is make two or three long delron pads like the ski’s but I would have to machine them up and it would take more time.