The swap is pretty easy, you might need a longer hose. I considered switching to a double tank set up on mine, that way you can pull the empty and fill it while running off the other one. That would require a new dual tank regulator and a couple of hoses, not a major project. All the single 40# tank does is let you go longer before you run out.
One concern of mine is the added tongue weight, the little Coleman is a bit tongue heavy to start with, by adding more weight you are getting above the recommended 10%-15% range.
I considered aluminum tanks $$$, and
the composite tanks, also pretty pricey but would allow more LP for less tank weight. In the end I just ended up carrying a second tank in a milk crate in the back of the truck.
Aaron
__________________