I have seen pictures of people drilling holes all over the area of the running boards and using machine screws up through the bottom with nuts on top. The bottom of the bolt has to make good traction(a nice cheese grater for shins as well). You'd probably just want to make sure you use the shortest machine screw possible for your boot to touch and use red loctite so they don;t vibrate out.
I did a set for my Indy Tril. They work magic! I took a peice of sheet metal, cut it to size, marked a grid so that all the holes are even. Then I punched the holes through using a nail and hammer. I used six rivets to put them down.
Here's some pics:
Take some Tire Screws made for the ice and put them in the tunnel roll. Thats the most outer part of the floorboard. It works excellent. Just don't use cheap sheet metal screw because they will break and drill tiny starter holes otherwise they will probably not go in as easy and may end up snapping them. I've been there and done that. I have Rox Sled Treds on my sled and they work EXCELLENT. I've yet to hit my knee of shin on them and am hoping not to any time soon either. They give alot more support and stick out about an additional inch so they do have some leverage to them. That being said it would be a good idea to get some tunnel supports (fish bones) for your sled.
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