tailgate to bed cover

Does anybody out there know of a spacer or cover for the gap between the bed and tailgate of a p/up truck? when i drop the tailgate, my load of coal fills that gap. a real p.i.t.a. to clean it out. is their a better way ? i dont have access to a trailer and i don't want to pay xtra for delivery.

Just guessing ......

Would a swimming pool floaty noodle work?

Extra wide duct tape. Cheap and easily removed. Install when tailgate is down.

I used the swimmin pool floatie also with great success. Filling up a couple bags with coal and laying them across the gap works even better

aaah, the mighty duct tape ,thanks for it ideas.