If you go with the t-slot like the 80/20, you could use rectangular head bolts for quick installs, they come in lots of lengths too. I have L- track on the inside and use it for rings, to tie things down, there are really limited fittings for L-track. The bolt on version is only 1 size and one length, so for instance, you could not mount a long bolt and send it through your shovel shaft, and it is too thick for most quick fists.
Depending on what type of 80/20 you get, you can get the ends tapped so you could bolt them to the jack stands.
My $0.02