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This one has that aircraft look

Testing, it had large sparks coming from all 6 contacts. Thought is was unsafe to use at the time.

Do you mean those with bladders?

I find the hardest thing about hydraulics, it's bleeding out 100% of the air.

[BOOOOOOOM.]

Yes that is an exploded and split open piston tank that shot out of the bottom of the trunk. Neighbors windows were broken, trunk sheet metal split, and the bomb squad made a visit.  A guy living 2 1/2 miles away said he might have heard it.

This could have killed, I was extremely lucky, I learned long ago, never be in front of a car or behind a car when someone is starting, never be in line with the radiator fan, and this time, if it's a unknown, position yourself to avoid injury if something goes very wrong.

I do have the video, my back was turned to it, and you can see the yellow blaze appear and fade looking at it frame by frame, there was no sound from the camera I was using. Too bad it was not a real video camera, it might have caught the sound of the BOOOOOOOM.

I've seen guys put lead plates in their trunks, but you better reinforced if your going that route.

adding an ground terminal is questionable, if the brush plate itself is not securely grounded.  Note on the image, if the inner casing is coated with an anti-rust solution, then there is the possibility of less than a 100% solid ground.

It may be best to solder the brush plate or use screws, washers and nuts to insure a 100% tight fit.

Also, the 3 hold down holes would be ideal to attach a ground strap with a soldered on ground terminal.

This is an educational site, learn from my setbacks.
Just a minor glitch. It happens, More details later,

That is part of my Monster Green valve from the 70s
next is what left of the hydro-aire valve

After all that, did I kinda answer the question? 

Basically what I am stuck on is pressure. The way I am picturing it is, you need a certain amount of pressure to overcome the force of the car.(Which would be mass when the car lifting from still, but mass and acceleration if it's is falling back down from hopping...right? ).

Now when you have already reached that pressure, what happens when you add more? Will there be a significant, or any performance increase? What I am getting at is, would it be wiser to use that additional energy to create more volume? A real world example that I can imagine would be a performance gain after swaping to a larger gear.(Which = less pressure, more volume.)

Smaller gears are less strain on the motor and what powers the motor.

Using larger gears, causes more stress on the motor and batteries (if we keep the cylinder ID the same)
If you can maintain the same stress on the system, then volume over pressure would work.

Once you have the pressure to begin raising the car, (approx 1000PSI and depending on cylinder ID), all you need from there on is volume. - Massive amounts of volume like with tandem gear heads.

Now you get more flow, but at what expense? The motor needs the power or batteries to over come the torque needed to pump more fluid.

So the average motor most likely will not work, you install a 50HP VDC motor, with the required  power/batteries/amps and it's works. So if your plan is to hop higher, (not faster) volume is what is needed at all phases of hopping. Notice how the motor kind of whines or wheezes just as the switch is hit, its the motor stressing. (IMO) Use a much higher HP motor and (IMO), you will not hear that.  or what I like, is high torque and high speed motor.

So, it's the motor that can not handle the stress, you over come the needed amps by increasing the volts.

To me pressure is like filling a void. Too much void and very little happens.  Too much pressure is like a bomb, so lets use volume over pressure. It's safer.  

I think they are as actuators as small as " with a 1." throw. The scissors will be approx the 7" so I am thinking 7x7x2.5" for the complete unit. But, you could mount this on the trunk lid. Plenty of space up there, plus for show, just have the unit with a cover and chrome it.

If someone wants to brainstorm, I am 100% sure the idea can be reworked to save space, parts, and time to make. You see, on paper the idea looks do-able, but in real life, there can be many many bugs to work out.