Very true. I have used my 8K to pull out trucks and stuff too. You just have to be careful. 8K is fine for most Jeeps and light Toys. 9.5 to 10 is great for Land Crusiers and similar SUVs and light trucks or lighter vehicles (jeeps and Toys) that get into extreme situations. 12 to 15K for heavier trucks, old skool Hummers and the like.
Remember, if you have a a lighter winch like an 8K and need to make a heavier pull, say pulling out a medium pickup with a Jeep, you can effectively double your pull with a snatch block. BUT, be careful as you are not doubleing the capacity of the cable!!!!! If you block it, don't over pull your cable and hook.
Also keep in mind that the more cable that is on the drum, the less capacity you have. An average 8K winch with 4 layers wraped on the drum is now down to 5K capacity. Because of this, a snatch block not only helps give you more working capacity, it also gets more wraps off the drum to give you more inherant capacity. The draw back on the block is it halves the speed of you pull.
Sorry about the big type, just want to make sure people don't use it as a hoist!!!