I started out like you, thinking any osage had bow making potential. I brought a bunch of stuff home that was really firewood not bow wood. Most of the stuff in your truck is not bow wood. Look for at least 4" diameter, 36" or longer(for billets), trunks or limbs without branches.
One tends to get excited about finding the yellow wood, especially if you don't have any. Having pulled a bunch out of brush piles myself, I found out pretty quickly what was worth the effort and what was just junk.