Hey guys - still looking for some info. The pickup I'm looking at purchasing has a pill capsule metal tank in the bed behind the cab. Have been looking for similar designs online but can't find them on jegs, summit, or fuel safe. Just looking to learn what these are - tanks or cells - being I see them on a lot of pickups. Have used the search feature and learned about the foam in cells, etc. but very few pictures in the threads. thanks.