Double scissor jack for trailer ramp?

All,

I have a new (to me) glider and trailer. Good rig, but like most things,
capable of improvement.

The ramp that extends from the back of the trailer for assembly has a
single, car style scissor (spare tire) jack for raising and lowering the
fuselage. It rocks back and forth a bit too much, and that makes it a bit
too unstable for my taste.

I see other trailers with a double scissor jack that are clearly more
stable, and would like to go that direction. Can't find any info on Our
Friend the Internet about how to do that, though.

Can anyone point me in the right direction?

Are there any of these, new or used, available? (Yes, I know I could order
one from Cobra or Komet, but would like to save that for a last resort.
Looking for something here in USA, if possible.)

Any spares from trailers no longer in use?

Making one of these is acceptable, but would like some advice on types of
jacks to get, how to connect them, etc.

Thanks in advance for your advice,
Bullwinkle