Blue Rhino propane tanks

Both Blue Rino & amerigas exchange are light. It's a conveint thing if nessary.I never do but in a pinch, would. I use to work for Amerigas and have seen brand new tanks traded for exchanged tanks from people that bought a new bar-b-que and were to lazy to go fill so they traded at the store.I've also seen very old valve tanks exchanged all rusty and such. Good way to get a current tank if you got old ones laying around. I only have about 20 5gal. bottles that are all current, I know people in the bussiness, that helps keep them current, ha, ha.