The back parking lot for oversized can get a little crowded and tight when larger trucks, busses and RV's all park in the same little lot.
My suggestion is the Large gravel / dirt lot in the very back of the casino: 33.022965, -112.053348 This was the staging area for last year's construction so is very accessible for larger RV's and 5th wheel's.
In my opinion, this is the best RV option in the Phoenix area.
