I am contemplating this route as well, at least for the boil. Our deck is a great place to brew, except for one thing: the wind. We're on the top floor of a house on top of a hill and keeping the propane burner lit is hard on all but a very few days per year. Plus with a mobile stand I could always roll it back indoors if the weather degraded.
My biggest hesitation is not trusting this old house (or rather, its sketchy electrical system with its amateurish "upgrades" over the years--you would not believe some of the things we've found). Even with a GFI and careful practice, I think I would bring in an electrician just to confirm that I could use the outlets I plan to. That was why I haven't used my March pump as much as I wanted. I love it, and it introduces efficiencies and safety steps (no more up and down a stepstool with gallons of hot water!), and I can see using two of them as part of a mobile stand, but I'm hesitant. "Smoked librarian" is not a tasty beer adjunct.