Bleeding Propane from lg tank to small tanks??

Check out Ebay for this ((LIQUID PROPANE TRANSFER KIT SYSTEM COUPLER TANK GRILL BBQ FILLER FILL UNLOADING))

Pull all the gas out with this. Then keep it for later, or resell it. I know before long we will be getting a kit like this. And put it on our 300 gallon tank or the 500 gallon tank. As our company uses propane. To run our Furnace on a machine. And will be filling up my 40 lb tanks out of it also. PLus next forklift will run off propane also. Paid $25 for a 40 lb bottle last week.