East Phoenix RV parks are hit or miss. Frankly in Scottsdale there just isn't anything I would recommend, we have either stayed or visited each one (2). Along the east west main drags there are the mega parks and they are fine. You will find that they always have a space.
The recommendation of McDowell Mtn, frankly is the best overall park in the area. Surprisingly it is not that far out of Scottsdale compared to the parks on the east west drags. Yes its a 20 mile drive, but so are most of the other reasonable options.
Roadrunner lakes is another okay park, nothing special and its still just as far.
We have looked for the last 4 years to find a good park in the Phoenix area and have come down the the opinion that for us McDowell is one of the few best parks in the area, the others are further out. It is surprisingly difficult!
Good Luck!