As the local weather got warmer and as we had fewer dogs, none of the equipment was quite right. There was never enough snow for the sled locally (you need at least 4" so the runners don't dig into the ground, and 8" to hold a snow hook), and the rig and scooter aren't useful in more than 1/2" of snow.
So we got a fat bike -- good for 1 or 2 dogs, dry trails, snow, muck, etc. Useful for both dryland and snow racing. All the other gear we had was all we needed; just hook up scooter line and something to keep the lines from tangling with the wheel and we were set to go.