The only time I EVER had to use a snatch block on my 2500lb winch to get any vehicle up, I picked up a 57 chevy in Nebraska my grandfather wanted. It was a farm field find, 4 flat tires and car sunk to the frame in the field...and once I got it popped out of the 4 ruts all 4 tires locked up tight too. It single line pulled it just fine upto the trailer ramps, then once it started dragging up ...
