RWD+snow - does adding weight to the back help? - bathtub tom
If you could see the amount of ballast the trials boys add over the driving wheels then it must be advantageous. I found the tyres made the most difference.
There's a rule for Production Car Trials now that there must not be a gap of more than 9mm between tread blocks. My Uniroyal Raintyres would fail that. Would be interesting to see how they cope with snow.