From someone who lived in Phoenix for 20 years.... Mesa and Apache Junction traffic will take you an hour plus to get downtown Phoenix.
Try the rv parks off I-17 and Deer Valley. It will be much closer to downtown, and you will have 2 optional routes. Either I-17 straight down to Indian School, if work will be in that area, or I-17 to 101 East to the 51 south for Camelback Corridor, depending where work is.
As others have stated... Plan on 5 miserable months, and if you have to pay for electricity, you will take it in the shorts.
There really is no choice, unless you want to stay in Camp Verde/ Cottonwood area. But, from there, plan on a 1 1/2 hour commute each way, at least.
There are a couple of pretty nice parks in the North Phoenix area. Monthly rates should be pretty inexpensive, since nobody in their right mind wants to be there from May through September. :-)
Edit... Ok...Desert's Edge RV Park ( The Purple Park ) or Phoenix Metro RV Park would be the recommendation, but there is also Desert Sands RV Park, and North Phoenix CG. The first two are much nicer than the latter.
There is also a couple in Goodyear area, which, depending on your work location, could be better. But, eastbound traffic on I-10 is actually worse than I-17.
Good luck. PM me if you need any local knowledge.
