[Great68]

Building a permanent carport is the ultimate, but if the budget doesn't allow it then you can at least get snow-load rated canopies. (And the good news is that the trees will reduce the amount of snow that hits the canopy)

No coating on the car is going to be able to handle the continuous onslaught of shit dropping from the trees. All that stuff is going to get in and build up in every nook and cranny.