Highly recommend the Flame King Refil kit. I went through 2 20lb tanks last year so about 40 refills. No issues at all. Every single time the tank is filled to the same level, you cannot overfill it. I did also buy 4 brass caps for storing them. They work great! Also I just looked and right now on Amazon the kit is the cheapest I’ve seen it. 33.49 for the kit (stand, valve, and a 1lb tank) and 10.98 for each additional tank.
Kit- https://amzn.to/2KSnUfc
Tank- https://amzn.to/2Oj1FBi