25" of snow is a lot of weight. Google says a cubic foot of snow weighs between 15 and 20lbs depending on how compact it is.
To do some conservative math.
15lbs per cubic foot
28 feet long
8' wide
24" thick
28 feet long by 8 feet wide is 224 Square Feet.
2 cubic feet per 1 square foot. 224x2=448
Now take 448 cubic feet and times it by 15lbs.
Thats 6,720lbs.
Now 15lbs sounds heavy for a light fluffy snow but lets say the light fluffy snow only weighs half that you are talking 3,360lbs.
I would try to clear it off for sure.
I find a easy way to get snow off is driving fast.