Honestly, it might be more of an issue of potential locations. I think the Safeway is the only parking lot large enough on Deuce of Clubs. Otherwise, the strip mall on White Mountains Blvd with Ross would be my pick. I have seen the Walmart on the 260 parking lot on weekends and a supercharger there would be ICE'd a bunch.
Tucson <-> Phoenix people:
If you are driving from the Phoenix east side, consider the US60/SR79 route through Florence -> Oracle, then hit the Skyline and Campbell Supercharger. Great location: La Encantada Mall. Several great restaurants (I like Ra Sushi), mall-wide WiFi. I'm hitting it in and out. Plus SR79 is a beautiful drive. Compare times on Google Maps, or ABetterRoutePlanner.