That inflatable is better than I imagined. You're really selling yourself short with all the stuff you're saying you can't do. First and foremost is no power outlet near the garage. So what? Get an extension cord. If you're going through the effort of placing a huge inflatable car cover on in the first place, then running an extension cord is not a big deal. Isn't there an outlet inside the garage? There better be if you're using it as a workshop. Finally, even if there weren't an outlet on the outside, and wasn't one in the garage even, adding one would be less effort than building a shed or car port. Heck, adding an outlet would be less effort than carrying all the stuff in the garage to the basement and setting up shop there. Quit telling yourself you can't do things.