What are these really tall jack stands for?

[Vinny]

When I was searching for a new jack I saw in a few catalogues these really tall jack stands. Like four or five feet tall. What are they used for? Extra safety for if a lift fails?

 

[The Cobbler]

transmission & engine jacks , could be used when replacing mounts or removing RWD transmission to support t the engine .

 

[finn]

Used to stabilize a vehicle when it’s up on a two post lift. One in the front, one in the rear. They really help.

Also useful as a third hand when changing exhaust systems, fuel tanks, etc on a lift.

 

[Hannahranga]

Stabilisation especially when you've taken the engine or something heavy out of a car.

 

[TurnipTruck]

Hold the engine up when the transmission is out.
Stabilize shaky or long vehicles.
Extra support when really reefing on parts.
Axle holder-upper when springs are out.
Exhaust piping support when welding hangers.

 

[danielbuck]

I have some pipe stands that go up to about 4-5 feet or so, I'll often use two of them, one on either side of a vehicle and put a heavy pipe across them, sort of a make-shift gantry crane. Comes in handy if you work alone, when mocking up some vehicle parts, you can suspend them in the air, and use clamps and **** to hold things while you measure or whatever you need to do. It's overkill sometimes, but having the ability to mock something up, then walk around it and look at things is nice

 

[Wamsutta]

You turn that giant screw jack thing on top to make micro adjustments to the transmission's elevation.

 

[Milton Shaw]

Also used for shock/spring service on rear wheel drive vehicles. I have one for use on my single post in ground lift.

 

[HalfTonTom]

Giraffe proctologists use those...

 

[whitesco]

5th wheel RV stabilizers… or I’ve seen similar used as such in campgrounds.

 

[whitesco]

Upon further review… maybe those are all tripod style:

 

[Shoreline_]

Just for propping or stabilizing something while it's all the way up on the lift / hoist.