Why can't you?
I'm the exact opposite. Winter snow tends to cover the hard protrusions in the road so I can get away with lighter tires.My snows are LT rated 10 ply, I'll be glad to get back on my C rated 6 ply or even XL metric radials for the summer.
Lost 2 -3 mpg and some ride quality even at 42 PSI in the front and 38 PSI in the rear.
That pressure looks to be just right driving in a couple of inches of snow the tread was staying nice and flat,
no crowning up from being to low or down from to high a pressure.
The LT's are much heavier about 20-30 pounds each.