[MrAtom]

Originally Posted by corksil

-throw a rope [or a stone with rope attached] over a tree limb
-connect rope to portable DC powered winch
-connect other end of winch to three lift-points installed on rope via carabiner
-push remote button on winch, watch bike be hoisted from truck
-move truck out from under hanging bike
-push remote button on winch, watch bike be lowered from tree limb
-disconnect carabiner, ride off into sunset with truck waiting for returning bike

ACME sells giant slingshots you could possibly use.