Lightweight, tall floor jack suggestions

[spookybathtub]

I'm looking for advice on something, sort of related to my Yaris.
I have a large case that I use for work, and I frequently transport it in the back of my Yaris (3dr hatchback). It's custom-built to just fit in this car, after modding the cargo area.

The problem is, it requires two people to load or unload, and I want to be able to do this myself. This case weighs 300lbs, and is 24x33x35 inches. It rolls on wheels, but must be laid on its side to fit in the car.

I want some kind of lift mechanism, that I could use to jack the case up to the hatch height, then I can push it into the car. I want this to be inexpensive, and ideally it would fit in the car when not in use. Some scissor jacks are tall enough, but slow to crank, and the small footprint would probably cause it to tip over with the large case on top.

I'll take a photo later showing the case in the car, but for now here is one showing it open. You just have to imagine the lids closed.