Thanks, guys!
I'm partial to the ideas that don't require "build", other than attaching eye-bolts and chain or cable or rope to lumber -- 2x4s and/or rafters.
"...get inside the canopy and crouch in the middle of the canopy with my back against the top. As I straightened my legs the canopy would lift off the truck..."
I remember (about a million years ago) my dad using this approach as part of the process to dismount the camper/canopy shell from our Datsun (pre-"Nissan") pickup.
I'm glad that my canopy's weight -- at 175 lbs (allegedly) -- is in the range that one non-Superman can wrangle without needing major mechanical advantage such as the burly steel jacks required for my FWC. And at that weight, no more than "body-weight", the gear (chain, rope, rafters) doesn't have to be too burly either.
ANY MORE SUGGESTIONS ARE WELCOME -- IT'S NOT TOO LATE TO SUBMIT YOURS!
I'm not quite ready to try anything yet...until I clear some junk out of the way in my garage.