A:  I am not aware of using it on gravel.  I don't think it would be stable enough.

A:  Not really, wouldn’t recommended as it’s not fully leveled.

A:  No, it needs to be on a flat solid surface.The frames bend if not flat.

A:  No

A:  Yes, although the surface should be level and flat. Each side of the lift must be fully seated and stable on the driveway surface.. I also use jackstands for additional safety

A:  The car raises up about 21 inches. You should have complete access to the steering and suspension.

A:  Absolutely, since this uses the factory jack points and frame of the car it doesn't interfere with the suspension components. Ive used mine to do quick tire changed as well as installing coilovers 

A:  sure. I've replaced brake, suspension, steering, and drivetrain parts on my vehicles.

A:  Yes. It lifts at the body pinch welds so the suspension will be fully accessible. I have replaced struts, shocks, and brakes with the Quick Jack.

A:  I am not sure.  The quick jacks aren't in any place to interfere with the steering components.

A:  China

A:  I think it is 21”.  This info can be found on the Quick Jack website to verify.

A:  depending on the blocks you use (2 different height come with it and can be stacked), 25"-28", plenty of room to work underneath most anything. I use it almost weekly for a 22 Corvette, 2012 InfinitiG37 vert and other cars in the collection. Just remember to use aux support jacks if you are working under a car. I trust the QJ locks, but not with my life.

A:  The lift fully extended is 21 inches, but using the blocks it comes with adds about another 3 inches. Max height for lifting your vehicle depends at what point it contacts the lift points. You can stack the blocks to achieve more height.

A:  Max height is about 24" depending on which blocks are in use. The set up allows for plenty of room under the vehicle

A:  2" Blocks - 18.4 inches 3" Blocks - 19.2 inches See manual at https://www.quickjack.com/pub/downloads/QuickJack-Car-Lift-Manual.pdf