Here in Alberta, most places charge a flat fee to refill tanks, and propane isn`t cheap. I have an auto-changeover regulator, one of the first mods I did on the trailer. If I`m paying $32 to get 30 lb tank filled, I want them to put 30 lb in it. I bought a spare 30 lb tank, and keep it full, and rotate out the tanks as they empty. I`ve never used 30 lb in a week, and always have one full tank, plus a partial on the trailer at all times. This 3 tank system works very well for us.
2012 Jayflight 28 BHS
2014 F150, 5.0 L, 3.55 axle