Just got back from our little test session at Goshen. Conditions were perfect:

We cleared the snow a bit and ran anyway.
Johnny killed 2 servos (Stinger and BMaxx) but that was the only car damage. Rob was running his old Lazer, drives ok but the radio has a 3 feet range so you have to run behind it.
Mark's X6 might handle like a 4wd but it still gets stuck like a 2wd!
The Soda truck went well but the batteries didn't last long in the cold. The D4 was awesome though - really planted thanks to some new yellow minispikes.
Got lots of pics on Johnny's camera if he can upload them