Race Sled Dolly?

[NorthMNSledder]

Does anybody know where I can get the sled dolly or plans for the attached pics? I have seen them at Snocross before and want a couple for the shop.

Thanks!

 

[BigRed118]

Looks like a good design but your track length would be an issue. It looks like it would not have great leverage the longer your sled.