I just put in an auto-switch valve/regulator and have it plumbed to 2-40# tanks. Just did it this summer, so this past week was really my first big test. So far I like the setup as you can look at the gauge and it has an indicator so you know when the one tank goes empty. I also still have a couple of 20# tanks for spares. This way I have no contract and I can go to the local TSC to get them filled.
Traditions only last if you pass them down to your kids!