Trolley jack vs. floor jack

[gravyface]

What's the difference?  They look like they function the same, but huge price difference:

http://www.princessauto.com/shop-garage/repair-equipment/lifting-devices/8036709-2-ton-trolley-jack?keyword=floor+jack

http://www.princessauto.com/shop-garage/repair-equipment/lifting-devices/8074668-1-1/2-ton-aluminum-floor-jack?keyword=floor+jack

[monty23psk]

To me they look the same except the minimun height. If you car gets really lowered, the floor jack would be the only one to work.

[PumpItUp]

floor jack is hydraulic. effortless lifting, and long enough to lift from the diff or crossmember

trolly jack uses springs. its basically the same jack you'll get in some heavy car, like a minivan or something, except its on wheels, has a longer pole, and is a bit heavier.

floor jack is not a bad investment if you work under your car a lot. saves a ton of time (takes ~20 seconds to lift & place jackstands) and your back, but it's not something most people have at home