If your car is 2'x4' and you load it 3' high, you've got 24 cubic feet of wood in there. Seasoned hardwood weighs in the 35-40lb/cf range, so you have potentially 960lbs of wood + the car being lifted with an 880lb rated winch.
I did the same thing....and wore out a couple of cheap winches until I finally went with a 2700lb rated one.
The volume of wood is closer to 38" wide, 16" deep (one standard row) and 48" tall... which by my math gets me about 17 cubic feet @ 40lb/cf = 680 lbs
yeah agreed, I haven't left a lot of extra capacity, or purchased a high quality lift, but I do believe I'm within spec. when that hoist dies... I'll buy the next size up.