I use Flying J for LPG. They have RV lanes where you can fuel up and get LPG also most have dumps for your black and gray tanks. One stop for all your needs while you fuel up. Prices are competitive for fuel, see website above, and tank dumping is free. Lanes have room for the coach and toad/trailer.
Last fall, we filled our RV's LP tank in our area at a place called Taylor Rental in Carpentersville, IL on Route 25.
Behind the building, they have a propane filling station. It has the meter reading like the old style gas station pump. Our propane tank holds 42 pounds, and it cost LESS THAN $15 to fill it from completely empty.
Bought new in June 2007, Phoenix Cruiser-2350
Fits inside our garage.
Dingy towing a red Toyota MR2 Spyder
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