I've seen winch ratings, both ways...
I've noticed "lower priced" winches are more times than not, are rated for rolling load. The better winches are rated for actual pulling power.
I'm not talking about boat winches, I'm talking about recovery winches! It's just that many buyers of cheapo winches use them for boat winches. Duty cycle kills more electric winches than anything else, actually it's people NOT paying attention to the duty cycle.
I've seen many times the warning to NOT use a recovery winch for a hoist, it's not about the rating, it's about covering their behind when you do something stupid and hurt yourself. The gov specs for using one for a hoist is different than using one for recovery...
Personally, I wouldn't trust a cheapo winch, to be used for over head use!
SR