Since I already carry one of these in all of my vehicles, I thought of using 3 collapsible square metal tubes (with pins) on top of this cheap ($40) remote operated 12V 2-ton harbor freight jack (using 2 bolts crossed at the bottom to fit in the jack slot) to manually lift the top for those sore back/neck days. I would simply make a plate and bolt it under a seat cushon, that would double its job, to disperse impact with the top.
Yes, and it also lifts my heavy 1-ton axles (small bursts on the button saves the tiny amp fuses they supply)