I have a 3 keggle set-op that I run off 1 20# tank. I run the regulator/hose to a header with 3 needle valves, one for each burner. When I am doing 2 10 gallon batches at the same time, I usually have to swap tanks during the boils because the amount of propane I am pulling freezes the tank. Otherwise it works great.
On Deck: Yo Mama!
Primary: Oatmeal Stout, 219 APA
Keggerator:Apfelwine, Honey Blonde
Secondary- Simply Strawberry (5 gal), Strawberry-Rhubarb (2 gal),Plum (5 gal)