Since we camp in COLD country a lot... I looked into the extra propane capacity too... After a lot of careful thought, I gave up on that idea and use the "stay a while" adapter that lets us tap into a 20# or 30# portable cylinder for the extra capacity.
We also have a Camp-Chef stove and we use the same cylinders for it. We now carry two full cylinders in one of our storage bays all the time.
But now that we are still camping in cold weather, we filled up 4 weeks ago and have been thru the Minnesota Artic Bomb Cyclone this week - and still have almost 3/4 tank. We have not had to get the Stay a While hooked up so far.
Steve & Stacy,
Oliver, Ned and Ellie ( Yellow Lab, Red Lab, Border Collie/Boxer)
2015 Seneca 36FK
2007 Toyota FJC - on the trailer