You mentioned you want to be 30 minutes of the Brewer's Spring Training. That park is on the west size of Phoenix between I-17 and 101.
So....don't even consider Tucson or Benson. You need to look in Phoenix and there are places in the Phoenix area that are even further than a 30 minute drive. Phoenix is huge.
You might consider this park that welcome children:
Desert's Edge RV - playground, pool, laundry,all ages welcome
Desert's Edge RVHave a great trip!
Full-Timed for 16 Years
.... Back in S&B Again
Traveled 8 yr in a 40' 2004 Newmar Dutch Star Motorhome
& 8 yr in a 33' Travel Supreme 5th Wheel