I had pallet that was sort of like crossed 4x4s. Top layer sticks out to sides. Gives you a place to lean rifles so they can cool standing up. Wasn't on purpose, but works great. Lots of different things could be done.

I've also got a poratable shooting bench. I like it. But wanted a table for stuff. Also I get nervous with 50lbs corn shooting bags on it, or something big like lead sled.