I didn't find any in RV Parks review. I'm going to a concert in October and we'd like to stay as close to the Arena as possible.

Pueblo El Mirage RV Resort & Golf - El Mirage
Cotton Lane RV & Golf - Goodyear
Destiny RV Resorts-Phoenix West - Goodyear
Ramada/Grand Inn RV Park - Peoria
Sundial RV Park - Peoria
Paradise RV Resort - Sun City
Donorma RV Park - Surprise
Sunflower Rv Resort - Surprise

I'm not sure of mileages, but Pueblo El Mirage may be the closest to the arena. Both Cotton Lane and Destiny are close to I-10 a short distance from Loop 101 where it's a short drive north to the arena.

Couple suggestions. Sundial: avoid. Ramada: avoid.

If you have a bit of time to explore: McDowell and about 120th Ave, there are two mobil home parks, one (possibly both) accepts RVs. You might stop by and try that first. That would be about 5 miles, and the closest to the arena.

Cotton Lane would be roughly 20 minutes on surface streets: north on Cotton, east on Indian to 99th, then north to the arena. The freeway might be a bit faster...or a lot, lot slower, depending on time of day.

The El Mirage/Sun City/Surprise area would be a bit closer in miles than Cotton Lane, probably roughly the same transit time.

Maricopa County has campgrounds at a number of parks. They may be further from the arena than you want, but you can check them out here.

http://www.maricopa.gov/parks/camping.aspx

Hope you enjoy the concert!

Don't know if this works for you but I went to a hockey game there in April. The arena and surrounding area is wonderful and I stayed right across the street at Cracker Barrel, they allowed me to overnight, very safe and fairly quiet.

I can't say how close to the arena it is But I can say that the Cotton Lane is very nice.
We have stayed there twice now as we have a daughter that lives in Avondale & it's the nicest park close to her.

Google Cotton Lane they have a web site. It's located near the old dog race track. Off I-10 exit 124. It's $29 a nite but do have Good Sam discount.