This is what we bought to add to our conveyor, works awesome, and it telescopes. Can't remember what it cost it was a few years agoThat would work, doesn’t need much. I ended having the parts department find me one, $350. Not sure what it will look like.
I noticed a pic of a JD air cart with what I assume is a factory conveyor and it had a nice long flexible spout with grab handles. Probably not cheap.