How to be a wheelchair user in winter?!

Thanks @egister I have argued with careco a lot about the slipping into the road issue you describe. I asked them to show me something that didn't do that. They just said I had exacting standards and it was my fault as I was leaning slightly to the side in the chair! Your answer about the mid wheel drive is sensible and makes sense to me so thank you so much. Waterproofing, yes, why on earth not.